I have had one for almost 4 years, and it's been a good fish. The only time I've seen him pick at a coral was with an SPS, when it was on it's way out and was RTN'ing. Otherwise, he's left my clams, zoos, LPS and SPS alone.
He did chase around my juvi Majestic Angel when it was first introduced, because the Majestic was smaller than the Potters. After a few days though, they were fine.
He eats EVERYTHING. Nori, frozen, pellet, etc.