There is a peaceful Damsel? I did not know that.

Seriously though, all kidding aside, all the species from this family of fish can be rude crude and obnoxious all out of proportion to thier often dimenutive size. The Yellow Tails seem to be the most reasobable of the bunch if you must have one. What about a Blue/Green Chromis, different fish family but very simular size and shape and far less aggresive, nor do they like many Damsels loose thier brillant colors as they get older and larger. Just a thought to possibly ponder...