C&H, Try to set it on the lr where you want it to be. Put the coral on it's side or at an angle so the coral will let go of the rubble and grab onto the lr. It may take a while for it to let go and then grab on where you want it to, I'm still working with one of my toadstools to get him to let go of a tiny piece of rubble. If you try to pull the rubble off you may hurt the coral, or tear it. This can lead to infection and obviously stress it.