This is what my Scott W. Michael book Marine Fishes says: "Harmless with corals but will eat motile invertebraes such as shrimp, worms, crabs, starfish, snails, and small fish. It doesn't mention immotile invertebraes like clams and says that it will not touch corals. Since the book mentions when a fish will harm clams, I'm assuming that it's compatible with clams.
Beautiful looking fish by the way.