some cories or ottos would be good for the bottom, but aren't the hardiest of fish. You an also look at some tetras, barbs and gouramis.
I'd start with the zebras danios and when ammonia and nitrites are at zero for a week, then begin adding others. Alot of the fish ive just recomended are schooling fish (excpet the gouramis) so make sure to get groups of the,