PJ Cardinals are better schoolers than Banggai's.
Chromis school when they're young, or in very large tanks. After they start to mature, they do tend to pick each other off. I've seen Banggai's do the same thing. (Hopefully Bang Guy will chime in)
Anthias
Chromis
Flasher wrasses (must be added at the same time, 1 male and multiple females)
Firefish will sometimes school together.