Hi im just curious i have a 20 gallon tall tank and right now all i have in it is 5 cory cats an just wondering what kind of a larger fish would be ok was thinking of an oscar but figure it would grow to big any ideas? thanks..
an oscar needs a 55gallon tank for a single. I wouldn't go over 4" in a 20gal, but it really depends on fish. Perhaps dwarf or gold gouramis or swordtails?