I would also be wary of the Chromis school. Though less aggressive than damsels, they can be misleading as well. Some people never have any problems with them. While others have had the school completely turn on each other leaving only 1 chromis left.
I am currently about to cycle my new 55 gal
tank. I love the idea of having some schooling fish, which is what most people go to chromis for to see. I am looking at Fowleria Cardinalfish, yet I have not made my final decision. They are peaceful and have a 30 gal