Danios, hatchetfish (you either hate them or love them, because of their shape), killifish, all stay near the top. Also, bloodfin tetras and harlequin rasboras stay near the top. If you are up. If you are up for a challenge, african buttterfly fish and archer fish are cool. I don't know the butterflys requirements, but if you want a community tank, then get the t. jaculatrix archer fish, they are more peaceful. Also, archers need brackish water.