Thanks folks! The paucifasciatus is going in my FOWLR... mostly other butterflies, and a few angels. I hope to put the muelleri in the reef, with a couple tangs, a couple yellow long nose butterflies, and a bunch of small fish like anthias and wrasses and such. I am undecided if I want to risk the declivis in the reef. Probably not, meaning I will probably have to catch my blackback butterfly out of the FOWLR before introducing the declivis, since I'm sure he will attack such a similar looking fish, as he's quite aggressive.