I would be careful with a firefish, with your current tankmates. Angels and Dottybacks are notorious firefish harassers. Especially in a smaller tank such as a 65gal. Besides firefish are small and do not fit the criteria of a "CenterPiece" fish.
I would think a colorful wrasse or hawkfish might be a better choice for your size tank and current residents.
I do love firefish though, just not in your situation...