Yeah, the filefish will eat cnidarians, tunicates, coral polyps, and crustaceans, and the moon wrasse will do a number on tubeworms and any type of urchin and crustacean. The moon wrasse (Thalassoma lunare) is active and amusing to watch with its boundless energy, but you have to pick its tankmates carefully. I saw one at a petstore that was housed with a menacing, adult dragon wrasse (Novalulichthys), and moonie kicked the crap out of it. Just tore it limb from limb. Destroyed it. Either type of filefish being referred to (Oxymonacanthus longirostris and Pervagor spilosoma) are poor candidates for the reef because spilosoma will feed on your crustys and tunicates and cnidarians and longirostris (the one with the poor survival record) only eats coral polyps, although on occasion, it can be trained, like some other obligate coral-feeders, to start eating sponge-based formulas.