My pearl bubble has been growing quite well. I put the bone into a hole in the live rock. It has been in that spot for a long time. The other night I was feeding reef chilli and saw this. The flesh of the bubble has grown off the bone over the rock and adheared to it like it is part of the skeleton. This surprized me greatly. Is it normal? First two were a long time ago. You can see the bone going into the rock.

