They get quite large and need alot of swimming room. They are, to the best of my knowledge, reef safe. I actually catch them ALOT up here in the atlantic off the coast of NY in the summer. I caught some larger ones in a drag net this summer. Cool fish but i've experienced many owners having problems with them, but i wouldnt be surprised if local fish suppliers are catching them locally just as I have and selling extra stressed fish for big $$$