So I suffered a tank crash 18 months ago just as I was starting a coral tank, and converted the tank to a external sump for my FOWLR tank. A couple months ago I got the urge to clean up the tank, build a sump, and try again with easy corals. As the water chemistry leveled off, one of my old mushroom coral popped it's head up off a rock in the corner. Today I moved it out of the corner and on to the bottom of a rock shelf. It looked like this when I picked it up and has stayed this way since. Is there anything I can do to save this, or is it pretty much gone?