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Brown spots on dry rock?!

Dylan7huskies

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My tank is about 3 weeks old and I had to remove the dry rock yesterday for about 5 hours to remove a pesty damsel. When I placed it back in I noticed these brown spots all over the rock? Any ideas what it is? Thanks!

B16C6A98-D6A9-44B1-871C-7ED9A0BBDBA0.jpeg
 

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