Wow....
Are you keeping it in a reef? Male or female?
From what I gather it is one of the most reef friendly selections available.
Best of luck with it.....very impressive fish...I've only seen a few at my favorite LFS and they've always been tempting.
Below is a bit of a quote from a article by Greg Schiemer.....
"The Genicanthus angelfish are as close to reef-safe as it gets. They are all mid-water planktivores and rarely pick at benthic invertebrates. I’ve kept G. bellus, G. melanospilos, G. watanabei, and G. semifasciatus. I’ve had G. bellus for many years and it’s my favorite in this genus. Not only has it proven to be completely reef-safe, it is a tough fish that does very well in captivity. Similar to all the Genicanthus angels, it must be fed multiple times per day in order to thrive. In this requirement, they’re similar to Anthias. I have to relate that I did have a bad experience with a pair of G. watanabei angels in my old 120 gallon reef aquarium. Both fish started picking at Acropora corals and had to be removed. I wouldn’t take a chance with the species again, but I know other reef aquarists keeping them without a problem."