My colony of Green Button Polyps and Red Mushrooms are getting out of control. Both are becoming a problem for other corals as they grow. I'm hoping I can frag them off but can't seem to figure out how. Sometimes I'm lucky enough The siphon the shrooms off during a water change, but most of them have a good foot hold on the rock. My LFS is usually pretty pleased when bring in a bucket full. The Green Palys just don't want to give. Short of taking my rock work apart and breaking it into pieces I ran out of ideas on how to get them out without killing them. Advice and techniques will be very appreciated!