Yes there are many different options so many in fact that I would spend all day telling you about fish. What you want to look for are fish labled comunity fish there are any number of tetras, livebearers (platys guppys mollys and sword tails), danios (minnows), corrys (small catfish), and Invertabrats (snails and shrimp) that you could add. What I would suggest you do is google for the words "comunity fish" and do some resarch.
Alternitavly you could ask the people in the Oddballs institute about some more unusual fish that you could have.
Good luck
Opcn