What I remember from my 3 hours or so of searching after first seeing this beauty, is that in early 1990's they were somewhat common, more so then Annularis angels. Since then, they've sort of swapped position with the Blue Line fading into obscurity. As far as what to expect, typical Chaetodontoplus I would imagine, though they do get somewhat larger then most I believe. Only thing would be to find out how deep they're found, just in case...