What's blocking this polyp?

Sierra_Bravo

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Any ideas on what the reddish-brown circular object is that's blocking the polyp on this tort? The frag came in with it; seems as if the tissue is starting to grow around it.

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tripdad

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It looks like a damaged tip healing. They get covered almost instantly by algae/cyano and the coral will slowly grow over it as it heals. My .02
 

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