Steve,
This is the fist time I have handled this rare West African deepwater butterfly. From my experience with most fish of the genus Prognathodes, they are safe with ornamental crustaceans, and are generally reef safe with most LPS and SPS corals. According to Scott Michael, individuals of this genus have, on rare occasions, been observed taking a liking to Trachyphyllia spp. brain corals and gorgonians if they are not well fed.
I would exercise caution if you are considering maintaining deepwater Prognathodes in your reef aquarium and be prepared to remove the fish if problems arise.
Regards,
Kevin Kohen
Director of LiveAquaria
Drs. Foster and Smith