Having been unable to trap my huge bristle worms that had stole food from my RBTA out of her mouth and caused her so much damage that she died. I am on a mission to distroy them. I have taken the rock out and am doing a fresh water dip. I have found several small ones dead and one huge one that was sticking out of the rock but O broke it off trying to get it out. My question is how long of a fresh water soak do I need to be sure they are all dead??? Thanks in advance.