My brain is in trouble. The skeleton is showing and it looks like brown flesh keeps falling off by the skeleton and shows more. Puffs during the day. I had it on the bottom on the crushed coral bed but moved it up and put it in a container near the top so it is not stressed, was doing better for a few days but still looks like it is receding. All water tests are in range . It has been in this tank for over four yrs. I did a iodine dip a few times but no change.