Whats the scientific name for it? I have a really in depth book on butterflies and that name isnt listed as a common one. The more spactacular butterflies I have noticed are rarely able to survive long in an aquarium. The closest thing I found to it is a Chaetodon melannotus which is called the Blackback Butterfly which while pretty, isnt as colorful as alot of the bad ones. If thats the one then do not put it in a reef tank heheh.