Rocks turning black any idea what this is???

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KevPool

KevPool

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Heya folks anyone know what could be making my rock black like this I have it in a QT setup but this one rock is turning a dark black colour. it is hard kinda like coralline algae



black rock.jpg
black rock 2.jpg
 
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vetteguy53081

vetteguy53081

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Pics too blue to tell but May be black sponge
 

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