Do they eat food or just pick on the tube worms and aptasias. I had one in my 180 for over a year after it was done eating all the aptasias it could reach and all the tube worms, it starved to death. I now have aptasias that were left reproducing again. It never bothered any corals or clams even when it was starving and I tried every food and way of feeding I could, nothing worked.