I had a small school several years ago. They were quite difficult to get but after seeing them in the wild they looked like really neat little peaceful fish. I think I originally got 5 or 6 and put them in a 180 mixed reef. For a couple weeks they were OK but then they started dropping off one by one. After losing the first one I watched the school closer and observed that there was quite a bit of harrassment of the lower rung fish by those higher in the pecking order. Despite increased feeding and a few other fish in the tank (angels, tangs, clowns) the #1 fish eventually knocked off all the others, and in pretty short order if I recall (matter of a couple days). They are really pretty little fish but beware of the school heirarchy (at least in my experience).