I have one and he literally scrapes zoas off their glued down plugs by running into them, and carries them around the tank. That said, its really beautiful and love having mine in my tank. My MP10 is near my return and he managed to jam himself between the two one day... I was able to remove him and adjust the MP10 so it doesn't happen again, but he earned a dent in his shell that is still there from it...
