I've had a grapefruit sized hammer in my tank for about 2 years now and it is doing great. Today I added a pair of True Percula clowns to the tank and it is already looking like they are going to host the hammer since I do not have an anemone in the tank. I read on another forum that eventually the clowns would kill the hammer. Does anyone have any first hand experience with a clown hosting a hammer or another member of the euphylia family that can share their experiences?