3 Answers. Hi, i've got in my 20 litre tropical aquarium, 5 Neon Tetra, 7 Guppies, 5 Platies, 2 Harlequins Rasbora, 2 Leopard Danio and 1 Sucking Loach. Otherwise start with at least 40 litre tank and keep 5 guppies. 21–40 Gallons Aquariums with holding capacities between 21 and 40 gallons are perfect for keeping up to a dozen small fish happy and healthy. They can also be kept with other peaceful community fish such as Mollies, Platies, Gouramis, Corydoras and … That may seem like a lot 22 small fish like that in a 20 litre tank but there is plenty of room for them to swim about in and it has been established for about 6 months now and not one have died. I was thinking about 3 or 4? “Does my guppy tank need a filter? Joined Apr 5, 2005 Messages 5,090 Reaction score 0 Location Southampton, uk. None. D. dwarfgourami Fish Connoisseur. Have tested the water this morning and the empty tank is cycled. Anonymous. Your filter should run four times the total volume of water in the tank through the filter each hour. The Neocaradina shrimp would all make good beginner choices. I have a 20 L tank with 4 guppies and currently have a filter but it makes a lot of noise and I'm worried the vibrations will stress the fish. If you choose to keep both males and females, keep them at a ratio of 2:1. After lots of time spent in the fish store she has decided on guppies. would that be to many or would I be able to keep a couple more? Favourite answer. you can put as much as 12 for each species of fish in your tank if you have an aerator....if you don't have one you might as … thanks. Tetras desire minimum seventy 5 Liter fish tank as they're very lively shoaling fish which desires longer fish tanks and to be in shoals of 6. you ought to maintain 6-7 guppies on your fish tank length and that's all. Lastly, be aware that filtration also plays a large part in how many fish your aquarium will support. 10 gallon/ 35 liters Fill one third of the tank and position your aquatic plants, decoration, driftwood and rocks. I now have a 55G. And another 55G. Or maybe 1 medium fish like a Siamese fighter or dwarf gourami. with 20 or 30 females and I CAN'T COUNT THE BABIES! 6 neon tetras + 1 snail OR; 2 platys + 6 ghost shrimps OR; 1 beta + 6 ghost shrimps or 1 snail. 10 guppies would be overstocked by far, 19 litres is under 5 gallons! with 30 or 40 males. My recommendation would be choose at least a 20 litre tank for a few fish if you are experienced fish keeper. How many Neon Tetra's or Guppies are acceptable in a 20 Litre tanks? Relevance. You can keep one Guppy per 2 gallons of water; for example, you can keep 5 in a 10 gallon tank and 10 in a 20 gallon tank. Is there anything we need to put in the tank … If you wanted multiple animals, Dwarf Shrimp would work well in that tank size. Answer Save. A 20 litre would be good for around 10 guppies or other small fish. How many would fit in a 30L? In a 20 litre, the only fish you could get away with is a single Betta. That means a 10-gallon tank requires at a minimum a filter rated at 40 gallons per hour. Here are some good combinations of tetras, other fish, shrimps and snails that can be kept in 5, 10 or 20 gallons tank: 5 gallon/ 19 liters 5 gallon tanks are small so your choice is pretty much limited. If you’re a beginner looking for tank sizes to hold approximately a half dozen platies under 3-inches length, a tank that holds 11–20 gallons is ideal. We were thinking 5-6 but I am getting conflicting advise. More fish can be kept in a 40 litre tank but maintenance would be bit high. 2 female Guppies plus 1 male Guppy equals.... at least 50 Guppies in 6 months... if they act like the 4 females and 2 males I started with 4 YEARS ago in a 29G. The minimum tank size for Guppies is 40 litres. 1 decade ago. 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