Wow Darren. That Semifasciatus is looking AMAZING! I have to come by and see him sometime!
The Genicanthus species of angel is your most "reef safe" angelfish that there is. I have a bellus, watanabe, and a pair of semifasciatus and have never had a problem with any of them bothering my corals.
I have been considering the bellus and watanabe and the semifasciatus just got added to the list. How are the tenperment of the three?
They get along fine. Initially there was some chasing and harassing between the females, but never anything serious. How big of a tank would they be going into? I would just make sure they have plenty of room.