Some fish I would recomend for a starter tank would be damsels, but since you don't want damsels, then we shall look at our options. A cousin of the damsel, the chromis is a hardy fish that not aggressive and if also pretty. You could also got with a type of goby, like a neon or a clown. Another popular fish that is fairly easy would be the clownfish, like a percula clown. If you want a royal gramma, they are pretty hardy but just let your tank run with another fish in there first for awhile before putting the royal in there.