Interesting. I have a punctuatofasciatus pelewenis hybrid in my FO. Back when the tank was first set up, I kept a few corals in there. It didn't touch any of then (softies, mushrooms, euphyllia, SPS. It also has a very different mouth structure than any of the other butterflies I keep, so that might be indicative of some other sort of specialized diet. Mine eats any fish food I offer, even pellets, with gusto.