Best Fish for a 5 Gallon Tank
Every species in our database that fits a 5-gallon tank.
Wondering what fish go in a 5-gallon tank? Below is every species in our database whose minimum tank size fits 5 gallons — then build and check your exact mix with the stocking & compatibility calculator.
Fish that fit a 5-gallon tank
Assassin Snail (1.0", 5g min, Peaceful)
Betta (2.8", 5g min, Semi-aggressive)
Cherry Shrimp (1.5", 5g min, Peaceful)
Chili Rasbora (0.7", 5g min, Peaceful)
Dwarf Mexican Crayfish (1.6", 5g min, Semi-aggressive)
Ghost Shrimp (1.5", 5g min, Peaceful)
Malaysian Trumpet Snail (1.0", 5g min, Peaceful)
Mystery Snail (2.0", 5g min, Peaceful)
Nerite Snail (1.0", 5g min, Peaceful)
Pea Puffer (1.0", 5g min, Semi-aggressive)
Ramshorn Snail (1.0", 5g min, Peaceful)
More AquaStocker tools & guides: Stocking & Compatibility Calculator · Fish Compatibility Checker · Fish Care Database · Build Your Own Aquarium · Aquascape Gallery · All guides
How to stock it well
Don't just fill 5 gallons to the brim. Pick one or two schooling species (groups of 6+), maybe a single centerpiece fish, and a small cleanup crew. Understocking is far more forgiving for water quality than packing it in.
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FAQ
How many fish can a 5 gallon tank hold?
It depends on the adult size and waste of the fish, not just a count. Use the stocking calculator with your actual species — a 5 gallon holds far fewer goldfish than nano tetras.