I bought a rock that has a whole bunch of mushrooms, feather dusters, etc. on it. Well, it appears that it also has a few little pest anemones/aiptasia on it. How do I get rid of the Aiptasia without hurting the mushrooms and everything? Can I get them off with tweezers or something? This is so frustrating because I have been so lucky so far and haven't had any bad hitchhikers. HELP!!!!