From WWM:
"Chaetodon daedalma Jordan & Fowler 1903, the Wrought Iron Butterflyfish. Found from central to southern Japan on the South side. A beauty that looks like it would be delicate, but readily adapts to captivity, eating all types of foods."
From SaltCorner:
General Husbandry: Has a temperature range of 72 - 78°F (22 - 26°C) and natural diet consists of algae and benthic creatures. Considered a good choice for aquariums. Requires mostly an enriched meaty diet with some algae/green foods, and numerous feedings per day. Provide a rocky environment with numerous open caves and coral rubble. Rare in the trade.
Saltcorner: Animal Library: Fish: Wrought Iron Butterflyfish
I'd still bet it isn't what is generally considered "reef safe", and would make snacks on your corals...