Ok, here's one. I received a spiny urchin on my live rock who grew to dime size in a couple of months. He was chewing up my coralline so I put him in the sump. He has been doing an outstanding job of keeping the sump spotless. Now he thinks he has to keep the powercord to my sump pump clean too. Do any of you think that since they can chew up rock, he can barbeque himself and my system?