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This^^^^ Also, you can safely pull the clam and scrape off the coral without issue. As @OrionN mentioned, PMD doesn't just show up without being introduced, most likely from another clam. All corals have a defense mechanism, some are chemical, which may cause other issues. If the mantle is retracting, then most likely something is irritating it. Check for hydroids, aiptasia, etc..PMD does not just come on new in the tank. You got to add a sick clam (with PMD) to the tank before you get it. That mantle is irritated by the coral. All coral has way to fight for tuff. It is most likely the coral irritated the mantle of your calm.