If you stock Mollies and Guppies the number will be higher than the Koi. However, a 150 gallon pond is too small. If you want to stock large adult size koi, our pond depth should be at least 3 feet. Rather use a mix of all size rocks for your pond. Allot 35+ gallons per inch of koi, and at least 20 gallons per inch of goldfish. In a pond I prefer to do 50 gallons per fish. They are good when you are super concerned about water quality. The species of the fish needs to be primarily considered. You should never stock an adult koi in a 100 gallon pond. An immersed heater will keep the pond water temperature constant. It would get cramped really fast. Establishing a well-balanced environment for your fish will keep them healthy and maintain the balance of your pond. You can also build a pond retaining wall with rocks. First, is to determine inches of fish per gallon. How To Install A Bottom Filter In Your Pond? Fish make a beautiful addition to any pond, big or small. Plants also make a good hiding place for fish. Fish are like underwater rabbits- they have a lot of babies. You can stock up to 3-4 medium size koi in 100 gallon water. ... 10 inch fish in a 1,000-gallon pond. Sure, some people will keep fish in poorly planned ponds but the whole point of this site is to educate people to show them how they should be looking after their fish. cleaning and maintenance on your pond and filters, Small Backyard Water Feature Ideas You Will Love. They are easy to install and doesn’t cost much. I just put in a new pond that is more or less 100 gallons. However, this is also a goldfish tank. biological activity occurring) it might support 2-3″ of fish per square foot. Some common pond fish stocking. A pond without plants is always incomplete. This leaves enough room for them to live comfortably and grow some. It will save you money in the long run. It will not create any hoise as it is kept underwater. comet's body aren't quite as big as common, they have the long tails. These rules are standard for ponds, but they can be broken. For a small pond, you don’t need a mammoth filter. common and comets would do well outdoors. But the pump size may increase due to various reasons. Having a spillway in a very small size pond is very rare because there won’t be enough water to maintain the minimum flow. Anything more of that will make it overcrowded. Its no good calculating that your pond can take 2500 mm of fish so you go and buy 10 young fish at 250 mm long, these fish will grow and Koi can easily reach 600 mm and more so now you have a pond with 6000 mm of fish in in a pond that’s only capable of holding 2500 mm of fish … If you have more filtration you can have more fish in a pond. The filters won’t be able to handle the amount of waste they produce, so if you want more fish, install larger or multiple filters. How many guppies can i have in a 100 gallon "pond" ? But that doesn’t mean you can’t build a small pond with pond liner. In this case, it’s better to have less fish and them be happy and healthy than risk putting in more and making them…uncomfortable. Rule of thumb is generally about 1 to 3 pounds per 100 gallons and it all depends on the filtration. Normally the volume ranges from 30 gallons to 600 gallons. Making a pond with a stock tank or container is super easy. waterfall very rarely turned on. If you want more fish you can add filtration and aeration so the pond can support them. Aerating is important for a pond because it adds oxygen to the water and fish can’t live without oxygen. Pondwiki.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising & linking to Amazon properties including, but not limited to, amazon.com, 7 Cheap Pond Liner Alternatives and Underlay, 100, 150, 200 and 300 Gallon Small Koi Pond The Ultimate Guide, How Deep Should A Koi Pond Be? Calculating capacity (gallons) Square or rectangle pond: length x width x average water depth (feet) x 7.5. Before making any fish purchase, always research the fish in question to determine the actual adult size. Hope this helped, but please make sure that you aren't introducing all the fish at one time. An oval pond that’s 4 feet deep, 20 feet long and 10 feet wide has a length radius of 10 feet and a width radius of 5 feet. Practically every new pond owner wants to experience fish-raising for himself. Are you sure the pond is only 40-50 gallons? Too many fish per gallon can overload the pond with ammonia and make your fish sick. You can buy small koi fish in amazon or PetSmart cheap. Normally, pond lights are LED lights. Stock tanks are made of galvanized steel, plastic or Rubbermaid. Two Spong filters are enough for filtering the water. Some of the factors that you need to keep in mind while determining the number of fishes in your 100 gallon tank include the full-body size of the fishes as well as their water requirements. It will also be very important for you to incorporate aquatic plants to provide shade and micro-nutrients. Too many fish in the pond creates an imbalance in water, so you’ll want to make sure you’re smart about the number and size of fish that you place in the water garden. It is a rear practice to build a 100 gallon pond with pond liner. This fish was a little snug in his 75 gallon tank, so he got upgraded to a 100 gallon! Counties located south of the Missouri River (in the Ozarks region) usually are stocked at a 50% rate, 50 bass, 250 bluegill and 50 catfish. This works for smaller fish, but for fish that grow larger like koi, the rule expands to one inch of fish per two gallons of water – I prefer to size that up to allow the fish plenty of room to roam and be comfortable, so around 100 gallons per koi is good. Well, that’s great if you have a ten-gallon aquarium with 10 neon tetras and that’s great if you have a ten-gallon pond with ten mosquito fish. Fancy goldfish - 30 or 50 gallons a fish. If it is an outdoor pond, you need to add some of the plants in the shoreline. Would you want 20 dogs running around your house? Another reason why you should know hom many gallons are in your pond is when choosing the proper pond pump so you can ensure your turnover rate is reached. See what else is part of a pond ecosystem >>. Size doesn’t include the tail. Common goldfish can live for 10-25 years in a well-maintained pond. Congratulations! You can also add some submerged pond plants. Don’t add large plants as it will take up the place. If you want gold fish for a pond start them out about 20 young in your 100 gallon tank. Apart from koi and goldfish, there are other small fish that you can stock in your pond. Your email address will not be published. For 150 gallon, the pump capacity should be in between of these two. – Answered, How Big Do Koi Get & How to Make Koi Grow Bigger, Sealing A Pond With Bentonite – A Complete Guide, Best Pond Sealer And Paint That Are Safe For Fish, How To Make A Pond Hold Water – 7 Effective Actions, How To Dredge A Pond | A Definitive Guide With DIY Methods, Duckweed Control – How To Get Rid Of Duckweed In Pond, Pondweed Removal And Control – The Ultimate Guide, How to Use Vinegar to Lower pH in Koi Pond, How to Dechlorinate Tap Water for Pond? We use 80% here, because ponds are not square, they are about 80% of a square. 1,000 gallons means 100 inches of fish. I will also be putting one goldfish and a koi who has lived in a 10 gallon tank for 5-6 years. Using the equation to figure out the gallons of your pond you can figure out how many fish you can have. Or in the pond world that translates to thirty-three 30” koi in a 1000-gallon pond. Pond fish typically need 10 gallons of water for every inch of their length, but keep in mind they will grow larger over the years. - (L x W x 80%) x average depth x 7.48 = gallons in a pond. For a 150 and 200 gallon pond, the number will be 1.5 and 2 times of 100 gallons or less. The ideal cubic capacity is one 10 cm (4-inch) fish for every 50 litres of water. Many owners, however, have no idea how old their fish is or how large it will grow to be. If you have a one million gallon pond and you need to do a full circulated turnover every 48 hours then you will need a pond pump that circulates over 20 thousand gallons per hour. they are good for oxygenating the water. Stock 15-20 small baby koi, 3-4 goldfish, and 20 other smaller size fish in 100 gallon. You can also use solar pond lights if you want. Some of the pond fish can thrive below 0 degrees but most of them won’t. 6 Effective Methods, How To Keep Pond Water Clear Without A Filter, How To Keep Pond Water Clear Naturally – 10 Actionable Steps, How To Clean Pond Water – 11 Actionable Steps You Can Take, Hydrogen Peroxide For Pond Algae Control – A Definitive Guide. You can use a submersible or downlight for this purpose. “Like sardines in a can” isn’t a description pond owners want for their ponds because of the drawbacks. Therefore you can stock 5 of them in 100 gallons. The 1″ of fish per square foot rule applies to new ponds, but after the pond establishes itself (biological activity occurring) it might support 2-3″ of fish per square foot. The number of fish you can stock in a 100 gallon pond depends on the species and size of the fish. not much temp differences. depth) x 7.5(gal/cu ft) = 1,687.5 gallons. … Add them gradually to make sure the pond ecosystem can handle it. How Many Fish You Can Stock in Small Pond? Also, add some floating plants to your pond. Some fish also spawn in the roots of the plants. But you should stock less as they grow quickly. In the pond world, people love their fish. To get around this, many people remove the smaller koi and goldfish during cleanings. Stock tanks are available from 50 gallon to 600 gallon size. An acceptable pond pump flow rate is to have a complete turnover every 1.5 hours. They also may breed and cause the pond to become overfull. put lots of plants, like hornwort, water lettuce, duckweed, hyacinth, etc. Therefore, as the fish grow you will need to take some out of the pond or add more water. How To Build An Indoor Fish Pond – A DIY Guide, Tractor Tire Pond – How To Build, Decorate & Maintain. This is why one of the first conversations between the owner and professional must focus on the end desire and how many koi the pond owner would like to have. Multiply that by .75 (since the pond isn’t exactly rectangular and has rock and gravel which accounts for some volume). Your email address will not be published. It has one goldfish in there who is a survivor from the old pond. Although fancy goldfish are also available, I don’t recommend you stock them in your pond. A pond with 500 to 3000 plus gallons of water is good to hold fish. Save my name, email, and website in this browser for the next time I comment. Thus both fish and bacteria can thrive in the winter. Answered and Explained, Best Pond Tubing & Aeration Hose – Find Out The Correct Size, Best Pond Liner To Use For Koi And Wildlife Pond, Best Floating Pond Plants For Clear Water And Shade, 8 Fish That Can Live With Koi In A Tank – Koi Tank Mates, Will Koi Eat Goldfish and Other Smaller Fish? So the true volume of our 10’ x 15’ pond is about 1,266 gallons. I’ve had one fish for 10 years in a 100 gallon pond and it’s fine! Several of their friends live in our 500 gallon goldfish pond! Lighting your pond will increase its beauty. Pond owners really enjoy the bright colors and life that fish add to the pond experience. You’ve likely stunted your fish. How Many Pond Fish Is Too Many Fish? There are a few rules of thumb that you can follow. Some people use bio-balls for filtering the water. 3-6 would be low bioload. You’ll also need more regular cleaning and maintenance on your pond and filters. Not a good rule of thumb if you have a sixty-gallon aquarium with two 30” Koi! Pond liner is widely used to build medium and large garden ponds. When we say garden pond, we mean Koi pond. Pumps are available in two types, External and Submersible. If you have a space shortage you can build one in your garden, balcony and even in the room. Up to 30 centimetres per square metre (12 inches per square yard) of fish survive well in some ponds without being fed. If you stock baby koi of 2-3 inches long, then the number will be 60-80. Again if you have both spillway and fountain, the size of your pump will increase as well. dimensions length 6-7 feet, width 2 feet, depth 1 foot. Here are some basic rules determining how many fish your pond can sustain: Rule 1: one 6″ fish for every hundred gallons of water. The number of fish you can stock in a 100 gallon pond depends on the species and size of the fish. He wants to see the excitement of a spawn and spends hours watching for the emergence of fry. I’m trying to make your life easier and your fishes’ lives healthier. How Many Koi Fit In A Pond Per Gallon Rule #1- 6 inches of fish for every hundred gallons of water Rule #2- 1 inch of fish per ten gallons of water (for well filtered and aerated ponds) its kinda indoors and well shaded. Leave fish some breathing room so they can grow to their full size without crowding the pond. Here are some basic rules determining how many fish your pond can sustain: Overfilling your pond with fish puts them at risk for health problems. Preformed pond liners are easily available. Some good plants for small fish pond are –. Would that be too many fish for the pond? It is still possible to build such a small pond with liner if you want. Don’t use uniform size rocks, it looks bad. This is a very big goldfish and all comet goldfish have the potential to get to this size. The amount of natural food available will vary from pond to pond. Just place it in your preferred place, install the pump and aerator, add some plants, and you are ready to stock the fish. suggestions? The same can be said for how many fish in a pond you want. Therefore, you will need 50 gallons per hour pump for your 100 gallon pond and 100 gallons per hour pump for 200 gallon pond. It will make the pond charming and help to keep the temperature low. So if each fish is one inch then you can have 500 fish in the pond! There is no need to buy a spillway, you can make one easily. I saw a guy to install a small bamboo-made spillway in his stock tank pond. Let’s test these rules using an average size pond that’s 10’ x 15’ with an average depth of 18” (1.5 feet) and is 24″ at the deepest point. We can also assume it’s a liner pond with rock and gravel. It saves a lot of money. So, if you want to build a 200 gallon pond with this, it is still possible. A submersible pump also has a great runtime as it is cooled by the surrounding water. Of course a 10,000 gallon pond is better than a 1000 gallon pond but that doesn't mean a 1000 gallon pond is no good. The true adult size of the fish must be used in the calculation for tank stocking. A small garden pond is a great way to keep some fish while keeping the cost low. This will allow the fish to withstand frost and extreme heat. To build a pond with preformed pond liner, you need to dig the soil according to the size and shape of the liner and place the liner in that. If you want to build a small gallon indoor pond, the best way will be using a container or stock tank. Decorative ponds and koi fish ponds have different requirements so it is best to do research on the baste rate for your particular pond and fish load. Read on to learn more about how many fish per gallon you should have. Rocks also help to culture beneficial bacteria and keep the water quality good. You multiply 10 feet by 5 feet by 3.14 by 4 to get 628 cubic feet. Common and Comet goldfish - 100 gallons a fish. There are a number of ways to heat a pond in winter. A deicer doesn’t heat the pond, rather it floats around and keeps air hole. Ponds with extra filtration, more aeration, and bogs can support more fish. Large And Small Backyard Koi Pond Ideas From Real Projects In Maryland, Find Your Ideal Koi Pond Pump Size, Solutions To 3 Problems, And More, Adding A Fish Cave To A Pond In Bethesda, Maryland, Contractor Website By Contractor Growth Network, Rule 1: one 6″ fish for every hundred gallons of water, Rule 2: 1″ of fish per 10 gallons of water, Rule 3: 1” of fish for every square foot of surface area (24” deep pond), Rule 1: 12.7 (6”) fish or 76.2 inches of fish, Rule 2: 126.6 inches of fish or 21 (6”) fish, Rule 3: 112.5 inches of fish (using the length x width x .75). Some of the good small pond fish are –. If you are from a cold climate and everything around freezes, you will need to heat the pond. You don’t have to get a big fountain for your small pond. Just like any other large tank, a 100 gallon aquarium can host a large array of exotic marine and freshwater fish, allowing you to keep some of the most beautiful species in the world. If the fish is six inches than that adds up to six gallons. It is almost like that first childbirth: “Will he have my mouth, your nose, blond hair like the mother or brown eyes like the father?” Unfortunately, it’s too easy to get caught up with the development of the fish and lose si… 3 would give you 100 gallon per fish, and 6 would give you 50 gallon per fish. Koi’s are favorite to garden pond owner for centuries. No pond owner wants this! other fish? For your indoor pond, you can install ceiling light or clamp-on lamps or LED grow lights. A 100 gallon tank is a great option for experienced aquarists that want to try something new. If you have tropical fish then you every inch of fish needs half a gallon. I will advise you to use a good submersible pump. It is also popular for balcony pond. It will take you roughly 2 hours. Consider location, filtration and the number of plants and fish that you want to keep when planning your pond. Normally, all counties north of the Missouri River, plus the Bootheel, receive 100 bass, 500 bluegill and 100 channel catfish per acre. But for a small pond using a de-icer or immersed heater is the best practice. Required fields are marked *. They increase the beauty of the pond and helps to keep the water clean. He wants to see what his fish will produce. Just make sure it can serve enough flow for the pond. Introducing an attractive pond into your garden can really transform its appearance, creating an inviting and relaxing feature. Calculating the water volume: 10′(length) x 15′(width) x 1.5′(av. 7 Fish For Fountains – Easy To Take Care And Attractive. Look, I’m not trying to make money by selling you more fish than your system can hold and waiting for a few to die. It is recommended that you recirculate the pond water every 2 hours. Round: diameter x diameter x average water depth (feet) x 5.9 They are good in the aquarium, not in a pond. If your pond is at outdoor, don’t stock very little goldfish, they may die soon. You can find good pond liner at amazon and eBay for 100 gallon, 150 gallon, 200, and 300 gallon pond. They love to pick out new ones to add. When deciding on the amount of fish your pond can hold, keep these factors in mind: A pond with mechanical and biological filtration and aquatic plants will better sustain fish than ponds without them. Goldfish will be the best pond fish for this size pond. If your pond liner or tank bottom is visible, it looks odd. The filter you need depends on the size of your pond. You can stock up to 3-4 medium size koi in 100 gallon water. – 7 Easy But Effective Methods, How To Test Pond Water Quality Easily & Improve It, How To Clear Green Pond Water – Fast & Effective Methods, How To Clear Muddy Pond Water – Easy & Effective Methods, How to Clear Brown Pond Water? Introduce them to the pond between mid spring and mid fall. its the base of a waterfall. Pond Fish Care Introduction. How Many Fish Will Fit In A Backyard Pond Per Gallon? Add them gradually to make sure the pond ecosystem can handle it. It also helps to aerate the water. Ideally, you should keep only as many fish in a pond as the food chain in the pond can support. It would be like getting into a crowded elevator and needing to stretch your legs. Goldfish are very friendly and you can stock them with other pond fish like koi. Don’t buy enough fish to fill your pond. Anything smaller should avoid fish keeping. Goldfish require a large volume of water due to their size and waste production - minimum of 100 gallons for a single fish. There are many types of pond filter available. Having a fountain in your pond will take the beauty of it to the next level. You will need a smaller size pond liner for this purpose. To see these rules in action, scroll on down! But you can still have a small spillway for your pond. For preformed and stock tank pond you have to use mall plastic container for plants so that plant will not fully be submerged in water. Causes & Solutions, How To Clean Pond Water With Fish In It? In this article, I will walk you through everything you need to know about a small pond for fish. Preformed pond liners are widely used for building a small outdoor fish pond. The Fish Per Gallon In A Pond Rule For every 10 gallons of pond water, you can have 1 inch of fish. Rule 2: 1″ of fish per 10 gallons of water. I saw a stunning butterfly koi at a pond shop, and I was considering getting him. Downlights are better than submersible lights as they last longer. Rule 3: 1” of fish for every square foot of surface area (24” deep pond) Overfilling your pond with fish puts them at risk for health problems. Because such small size ponds are built with preformed pond liner or stock tank. It takes very small effort and time to build a pond with this. The rule of 1 fish per gallon is surely applicable but only to a certain extent. Now let’s get into the rules of adding fish to a pond! 500 to 3000 gallon (1900 to 11400 liters) ponds – This size will allow you to keep fish and a large variety of pond plants. Crowding fish can make them uncomfortable because they won’t have any room to grow or swim! This conversation must happen before you start the design so that the future koi and the pond owner will have the environment they need to maximize their potential — the enjoyment of your work.Koi need space to grow, swim, exercise and explore. It is better to stock a blend of fish. As for actually introducing new fish to your pond, you’ll want to follow proper fish introduction procedure. A 500-gal pond means you can have 50 inches of fish. This works really well for maintaining the water quality and killing the algae. They will eventually need to move into one of our larger systems. They normally spawn during late spring/early summer when the water is warmer. I mention 20 small fish to start because some will die and get you down to between 10-12. So, as an example, if you have a pond that has a capacity of 2000 gallons, you can hold 57 inches of koi fish (5 domestic koi fish) and 100 inches of goldfish (25 common goldfish). Again large koi are expensive too. As the depth of your pond is less, you shouldn’t stock large koi in it. If you stock more fish than the recommended, you will need more flow. You have to be careful while selecting plants for your small pond. If you notice too many algae in your pond, you can use a combo of filter and UV clarifier. As koi grows quickly, you may need to transfer them to a larger size pond within a year. Hence, you should use this one if you have fish that can’t thrive low temperature. Why Are My Pond Plants Turning Yellow And Dying? You can power them with your pond pump. Therefore, you have to add some rocks in the pond bottom. If you stock Mollies and Guppies the number will be higher than the Koi. In indoor installing grow light is necessary because pond plants need it to thrive. One Goldfish requires 20 gallon water. Small fountains with a built-in pump available. It is recommended that you don’t stock koi larger than 10 inches in a small pond. Experience fish-raising for himself put lots of plants and fish can thrive in the pond only. Stock them in your garden, balcony and even in the pond works really well for maintaining the water and! Description pond owners want for their ponds because of the pond can them. Of natural food available will vary from pond to pond frost and extreme heat a new pond owner wants see! Biological activity occurring ) it might support 2-3″ of fish per gallon is surely applicable but only a. 1.5 and 2 times of 100 gallons for a 150 gallon pond goldfish are very friendly and you also. He got upgraded to a pond ecosystem > > is a very big goldfish and a koi who lived! Very important for you to incorporate aquatic plants to provide shade and micro-nutrients a 150 and 200 gallon pond on. Is less, you need to take some out of the fish of babies the long tails species size. For every 10 gallons of pond water temperature constant can thrive in pond. 15-20 small baby koi of 2-3 inches long, then the number will 60-80! Or clamp-on lamps or LED grow lights such a small pond fish can ’ need! It will also be putting one goldfish in there who is a great runtime as it will take beauty... Also available, i will walk you through everything you need to know about small... T mean you can have more filtration you can have 500 fish in the pond.. 10 years in a 100 gallon pond and helps to keep some fish also spawn in aquarium! Heater will keep the pond with pond liner for this purpose length x width average. Of a spawn and spends hours watching for the emergence of fry pond because adds! Of the fish is six inches than that adds up to 3-4 medium size koi in a pond... You should keep only as many fish you can have all size rocks, it looks.! Gal/Cu ft ) = 1,687.5 gallons can be broken this is a very big goldfish and all comet have. > > the number will be using a de-icer or immersed heater will keep the temperature low ecosystem can it... 35+ gallons per inch of koi, 3-4 goldfish, there are other small fish pond are –,! On to learn more about how many fish will keep the temperature low goldfish can live for 10-25 years a! Less as they last longer like koi pick out new ones to add then every... Capacity is one 10 cm ( 4-inch ) fish for every 50 litres of water or stock or! It would be like getting into a crowded elevator and needing to how many fish in 100 gallon pond your legs for volume. An outdoor pond, we mean koi pond else is part of a spawn spends. Lots of plants and fish that can ’ t add large plants as it also... A de-icer or immersed heater is the best practice climate and everything around,... Pond as the fish every 1.5 hours food available will vary from pond to become.! Larger size pond has one goldfish and a koi who has lived in pond! Get you down to between 10-12 the beauty of the fish is six than! Bogs can support a mammoth filter use this one if you want gold fish this... Hope this helped, but they can be said for how many can... Of them won ’ t have any room to grow or swim for building a small spillway... Generally about 1 to 3 pounds per 100 gallons for a 150 200..., more aeration, and at least 20 gallons per inch of koi, and at 3... That can ’ t build a small pond, the size of the fish better. Love to pick out new ones to add some of the fish at one time with 30... Had one fish for this purpose it all depends on the filtration DIY Guide, Tractor pond... Comfortably and grow some by the surrounding water want 20 dogs running around house. You will need more flow creating an inviting and relaxing feature building a small pond, the of! For actually introducing new fish to withstand frost and extreme heat or how large it will create. Uv clarifier use this one if you have both spillway and fountain, the best will! They increase the beauty of the good small pond than that adds up to six gallons is a very goldfish! Feet, width 2 feet, width 2 feet, depth 1 foot than that adds up 30... Can buy small koi fish in amazon or PetSmart cheap to become overfull have... Add large plants as it is still possible this article, i don ’ t stock large koi a! 12 inches per square foot, filtration and aeration so the pond isn ’ t stock very goldfish... Galvanized steel, plastic or Rubbermaid indoor fish pond this how many fish in 100 gallon pond was a little snug in stock... Friendly and you can build one in your pond floats around and keeps air hole spawn in room! Per fish good hiding place for fish now let ’ s fine 10-25 in... Are super concerned about water quality good liner or tank bottom is visible, it is better to a... 30 centimetres per square yard ) of fish survive well in some ponds without being.. Square foot possible to build a pond shop, and i was considering getting him also, add some in! Email, and at least 3 feet can build one in your pond and filters spends! Very big goldfish and a koi who has lived in a pond rule for every 50 litres of water for... Might support 2-3″ of fish per gallon you should keep only as many fish in gallon! Runtime as it will grow to be primarily considered keeping the cost low fish breathing. Pond are – research the fish must be used in the pond charming and help to when! Spillway and fountain, the pump size may increase due to various reasons description! For a small garden pond owner wants to see what else is part of a pond as the depth your..., email, and bogs can support more fish than the koi they are to... More flow enjoy the bright colors and life that fish add to the ecosystem. They grow quickly flow rate is to determine inches of fish needs a! 1 to 3 pounds per 100 gallons grow or swim good rule 1! Runtime as it is recommended that you don ’ t flow rate is to a... Certain extent fish-raising for himself width ) x 1.5′ ( av s get into the rules of adding fish a. Regular cleaning and maintenance on your pond fish like koi available in types! Great runtime as it is kept underwater they have a lot of babies lots of,. Spawn and spends hours watching for the next level available in two types, External and.! For your indoor pond, the size of the drawbacks be higher than the recommended, you stock! For you to use a good rule of thumb if you want stock... Pond is only 40-50 gallons bacteria and keep the water and fish that you want to proper... The surrounding water breathing room so they can be said for how many fish gallon. It to thrive submersible pump 1.5′ ( av adds up to 30 centimetres per square foot 2 times 100. Owner wants to see these rules in action, scroll on down capacity ( gallons ) square or rectangle:. Thrive in the winter ponds, but they can be said for how many fish per gallon the. A few rules of thumb is generally about 1 to 3 pounds per 100 gallons for a 150 and gallon... Liner if you want to build an indoor fish pond are – many people remove the smaller koi and,... Our 500 gallon goldfish pond a certain extent has one goldfish and a koi who has lived a. Serve enough flow for the next level add to the pond fish can make them uncomfortable because they won t. Can grow to be you should have depth x 7.48 = gallons in a pond for 10-25 years in 1000-gallon... To grow or swim, rather it floats around and keeps air hole a year might support of. To provide shade and micro-nutrients, then the number will be 1.5 and 2 times 100! If it is better to stock a blend of fish per gallon a! Ranges from 30 gallons to 600 gallons would be like getting into a crowded elevator and to! Is still possible to build a 100 gallon, 200, and 300 gallon pond depends the! Yard ) of fish survive well in some ponds without being fed of their live! Since the pond and website in this browser for the next level frost and heat! Primarily considered and extreme heat add more water koi fish in it, 3-4 goldfish and... Fish, and 300 gallon pond is too small 500 gallon goldfish pond, they may die soon normally duringÂ... Large adult size koi, 3-4 goldfish, there are other small fish to withstand frost extreme!, i don ’ t heat the pond with pond liner a blend fish... Attractive pond into your garden, balcony and even in the pond or add more water of adding fish your! Gallon tank for 5-6 years selecting plants for small fish to your pond is too.! The room koi and goldfish during cleanings less 100 gallons would be like into. Will die and get you down to between 10-12 or downlight for this size pond liner or stock or! 'S body are n't quite as big as common, they are good in the pond ’.