Blue Regal Hippo Tang are not reef safe, but they do school together.

>>but I saw Vihns tank where he has a few and they looked nice. They didn't seem to really school around, but cool to watch several of the same kind of fish interact.

Maybe I don't have enough chromis in my tank to school. My friend have about 20 chromis in his 90 gallon corner, and it look pretty cool swimming together.