I wqould go with a 6 foot FOWLR for one reason. Teenagers can be destructive people... So with a six foot tank, you have the water volume to handle most minor vandalism (dumping stuff in tank) and FOWLR because that way if a teenager gets angery over something and decides to dump 30% HCl into tank your not killing off an entire reef but just fish, still a loss if just fish die but at least its only half of a loss.
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