I find that most fish school only for protection. I've bought a small school of chromis and anthias in the past - they will school together for the first week or two but once they realize there is no longer a presence of a threat, they stop and start in-fighting for hierarchy.
Anthony used to have FOWLR with 5-6 yellow tangs and it was an awesome sight to see them in a tank. They swam independently and did not swim in a school like in that pic.
That is an awesome picture BTW
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