Best Fish for a 20-Gallon Tank

117 species in our database are suited to a 20-gallon aquarium. Mix one schooling group with a centerpiece fish and a small cleanup crew, then verify the combination with the stocking calculator.

Schooling fish

Neon TetraCardinal TetraRummynose TetraBlack Skirt TetraSerpae TetraGuppyEndler's LivebearerPlatyZebra DanioHarlequin RasboraChili RasboraCherry BarbTiger BarbWhite Cloud MinnowBronze CoryPanda CoryOtocinclusKuhli LoachMarble HatchetfishEmber TetraBlack Neon TetraLemon TetraGlowlight TetraBloodfin TetraEmperor TetraSilver Tip TetraX-Ray TetraGreen Neon TetraCelestial Pearl DanioLambchop RasboraPearl DanioGlowlight DanioGold BarbCheckerboard BarbFive-Banded BarbNeon Dwarf RainbowfishThreadfin RainbowfishCelebes RainbowfishPygmy CorySterbai CoryJulii CoryUpside-Down CatfishHillstream LoachLeast KillifishRosy Red MinnowGold TetraPenguin TetraRed Eye TetraFlame TetraGalaxy RasboraPhoenix RasboraEmerald Eye RasboraAxelrod's RasboraLeopard DanioGold Ring DanioMelon BarbForktail Blue-eyeEmerald CoryAlbino CoryThree-Striped CoryAdolfo's CoryHabrosus CoryZebra OtoDwarf Chain LoachClown KillifishHigh-Fin PlatyBalloon MollyAmerican FlagfishIndian Glassfish

Centerpiece fish

Betta (male)German Blue RamBolivian RamApistogrammaKribensisDwarf GouramiHoney GouramiSparkling GouramiChocolate GouramiParadise FishMultifasciatusClown PlecoDwarf PufferfishFigure-8 PufferGolden Wonder KillifishBamboo ShrimpRabbit SnailLicorice GouramiCroaking GouramiThick-Lipped GouramiPeaceful BettaStrawberry BettaGolden RamFlag AcaraYellow Dwarf CichlidAgassiz's Dwarf CichlidHongsloi CichlidCheckerboard CichlidShell-DwellerBlue Dream ShrimpYellow ShrimpBlack Diamond ShrimpBumblebee ShrimpRed Claw CrabLyretail Killifish

Cleanup crew

Bronze CoryPanda CoryOtocinclusKuhli LoachCherry ShrimpAmano ShrimpNerite SnailMystery SnailGhost ShrimpAssassin SnailRamshorn SnailMalaysian Trumpet Snail