SuperGlue usually doesn't work. The chemical reaction from the SuperGlue causes chemical burns on the tissue of the Corallimorphian. In its defense, it creates a mucous coating and usualy will no longer be attached by the superglue. On occassion it will tolerate the glue and attach to it. It would be better to either net it down, or take needle and thread and sew it through it's foot to the rock.