1 fish per 10 gal is a good rule of thumb but if you have good filtration and know what your doing you could probly get 4 or 5 fish comfortably in this tank i wanna get 1 more fish but im not sure what im torn between a purple fire fish a hawk fish or a flame angle also my tank is doing great coraline alge has boomed and is every where and i like coral better then fish so my money goes toward coral and put fish on the back burner lol