I have a rock in the center of my tank that had a RBTA on it. I love the position and having the nem there. However, it has split twice and now there are three on that rock. It is a rock that is easily removed since it sits on it's own. I would like to remove two of them and share with fellow reefers because the 3 of them are crowding each other. I am afraid they are going to start walking on me. Is there an easy way to get them to release their foothold? I don't want to harm them in anyway.