This is my 20 gallon freshwater fish tank, the filter is a Top Fin 20 and it is lightly planted. 1 Dwarf Gourmai 2 Zebra Danios 4 Male Guppies 4 Neon Tetras 4 Bloodfin Tetras Planted with 8" White Ribbon & Amazon Sword... 20 Gallon Aquarium Fish Tank - 89 results like Aquarium Tank Glass 20 gal Jw Fusion 200 up To 20 Gallon Aquarium Fish Tank Air Pump It depends on the fish species For example a torpedo shaped fish like a neon or a Guppy is slender and doesnt make very much mess Probably ten such fish would do 20 Gallon Fish Tank - 127 results like Oscar Rapids C80 Canister Filter - Up to 20 gallons - 25 in x 55 in x 8 Danger Label for your Aquarium Fish Tank 10 20 55 or any gallon 900 Time Remaining 4h 8m Bid now JW FUSION 200 up to 20 gallon Aquarium Fish Tank … 20 gallon fish tank This page was last updated Apr-29 1617 Number of bids and bid amounts may be slightly out of date Dec 08 2010nbsp018332Hi everyone its darren this how many fish in 20 gallon tank considering guppies swordtails tetras danios and