How many fish can be kept in a 3.5 gallon tank?
How many fish can be kept in a 3.5 gallon tank? Following the “1 inch of fish per gallon of water” rule of thumb, you can put three 1-inch fish in a 3-gallon tank. You can also keep invertebrate tank mates with one 2-inch fish, like a betta. You can unknowingly overstock a 3-gallon tank even if you bring home just one pet fish.