Can you tell me which cichlids school?

I think I've seen BIG tanks in a variety of aquariums that have some kind of Uaru or Severum shaped thing schooling. Like, hundreds. Can't remember what they were specifically, just that they were that shape and size. Haha.

The Oscar video is pretty sweet! If only, if only.
 
The true schoolers are the previously mentioned Tanganyikan ones. Yellow Labs are not very territorial, so their behavior appears similar to schooling. However I think it is food(or potential food) they are following, rather than truly schooling.
 
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