Tomato clowns seem to like redecorating the tank. Mine is a terror and it has gotten to the point where I am seriously considering taking him out of the tank and trading him away. He attacks any frag I put in the tank and tries to bulldoze it over. He's killed several frags doing this and I am constant putting things back in place for him to then knock back over. If yours is just digging in the sand then I think it just wants a host. Numerous corals make great hosts for these guys (Frogspawn, Hammer corals, hairy shrooms, ect) if you don't want to go with an anemone.