stangchris, that I can do. I like banging on things with a hammer, it's what I do for a living

His rock is in a holding tub, so it will be easy to get out. I just do NOT want to hurt him. He's lovely. I lost my other one in the tank crash :(

tebstan, I will give your idea a try too. The chilled water, I am assuming tank water/nsw?