Could be a sponge that is dead/dying. I have had sponges grow like that in between polyps. Its kinda hard without a clearer picture though. Are the polyps opening at all?
might be a bacterial infection. I would swish it arounfd in a container of disposable tank water(water removed from the tank that will be dumped out afterwards). do a coral dip then swish it again in some more disposable water. Then place in a QT.
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