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I will check those nodules closely , and yes you're right i won't jeopardize the rest for sure z it's just i wish it opened once againIt looks like something is on the polyp itself. Not quite sure what those little nodules are on the closed up polyps. Check for pests after lights out to see if anything is picking at the coral (nudibranchs, starfish, etc).
Also, if all of your other corals are doing well, don't go changing a bunch of stuff to save one coral. Sometimes this happens and a certain coral doesn't like our tanks and we shouldn't jeopardize the rest of the tank's inhabitants to save just one.