this is the Duncan coral I got from doc back last year when he broke his tank down before the move. It has been doing well and made it through the issues I had with my tank. Now the tank parameters are all in range. Only new that I have add is a GFO reactor. I noticed today that the tentacles are short and swelled and a couple of the smaller heads have come loose from the skeleton. I have always kept it on the sand and center of my tank. Any ideas as to why the heads would be coming off?