I find with Clowns, that they are the perfect addition to a smallish tank, Like yours. There are so many choices and varieties. Their are the Designer Clowns such as Black Ice, Piccasso,Wyoming Whites, etc. Or B&W or Percula and Ocelarris. Then the Tomato, Marroon, Clarki, and they range from 15 bucks a piece to several hundreds. You should do some research on them, I'll send you a pick of mine.