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old porites rock looking different


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so i have this chunk of LR that appears to be a porites skeleton or something like it. it of course has the little dimples all over it from where coral used to be but now stuff is a chang'n. i noticed today that in a small concentrated area and a few random spots, there is now some kind of grey matter filling back into the holes. i have never seen this before and was wondering if anyone else had? and are the hydroids to the right going to be a prob? i had some in my other tank that just came and went, but it was during my tanks demise so who knows.



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I'd kill the hydroids if possible. Better to get them now before they multiply, or before you want to put a coral close enough to the spot to get stung.

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