I had the same problem. Hammer coral, tissue was receding. Had a good look at the coral, saw something moving on it, took the coral out of the tnak, removed 3 big, fleshy coloured flatworms, gave the coral a dip and returned it to the tank.
It grew back out nicely, looked great for 2 months... now it is looking sad and receding again, I think I am going to try the flatworm Xit to see if it helps.
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