Pyramid Butterflyfish, Hemitaurichthys polylepis, is also known as the Zoster Butterfly and often found living on or around the reefs of the Indian and Pacific Oceans. Members of the genus Hemitaurichthys make gorgeous inhabitants of reef aquariums. Considered reef safe.
First of all, hilarious user name. Second, beautiful tank. What are the dimensions? Have you always had the orpheks on there? They look really cool above that tank imo. Was this a transfer from another tank?
My interests in reefing around the globe as of late have been in South America. Brazil is a hot spot for reefers. There's some awesome tanks down there. I have "help reef" I follow on FB. https://www.facebook.com/Help.reef/