If you take the rock out of the tank and gently go around the edge of the ric with your finger they should close up a little. Then take a razor blade and cut the foot as close to the rock as possible. I was really worried about doing this but gave it a try on 2 of my 15 cluttered ric's. I even cut a foot a little high up on one of them and they both survived

It was much easier than I thought.