Help ID this black stuff?

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Hugo Garcia

Hugo Garcia

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Hi guys, so I’ve noticed this dark patches on my dry rocks lately but today hey turned black! Please help ID

D587365A-E6B9-4F7A-AAA3-AC3BB85B94B5.jpeg
8A10B3B9-2712-4903-A1D9-192573665BBD.jpeg
 
Is it a good or bad thing?
 
https://affordableaquaria.com/

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