I knew someone with one of these years ago. Gorgeous fish when fully mature! They got theirs as a juvenile and it ate meaty foods from the start. Apparently as they mature and are introduced to tanks, they are more picky.
They do get big...this was in a 300 and it still looked big in there.
They are sensitive to nitrates too, so you've gotta watch those a little more than a lot of other Angels. It's also wise to add them last and into a well established tank, preferably with lots of algae.