NateHanson said:I'd say turbo snails.
Or what about a small Lawn Mower Blenny?
NateHanson said:In the end it would get to big, but if you got a small one it would probably stay small for a while in that size tank. It would use up a fair amount of your available bioload though, so it would have to be a fish you like. Personally I think they're cool looking and neat behavior.
Anyways, don't you have a 180g you can throw him in when he grows up!