Go brackish and get some archers and datnoids. A couple RBPs would be cool, or you could get a few young oscars and let them pair up. Or you could fill it with 100 guppies and then in a few weeks, add something to eat them all!
what I would do, which is my plan for my empty 125gal. once I have room, is to make it a heavily planted Amano style tank with a nasty school of exodons. you could put about two dozen in there safely and grow them out to their full length.
Since you said fish that don't get to big I would go with a really varied community tank with tons of neons,barbs,dwarf cichlids,Gouramis, Rasboras,Angelfish and maybe a couple of Discus and some more things like that.
If you want somethin a little bit more aggressive go for some of the medium to large SA cichlids with a couple cats. But in the end it all depends on what u can afford and ur preference.
O brackish would be sooooooo cool too!
i would put 2-4 in there at most and i would get maybe oscars, jds, green terrors, convicts, firemouths, or maybe a red devil.......any of those cichlids with bichirs would be real cool imo.....