Weird substance in rock

Beazy

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Does anyone know what this is? I’ve been battling hair algae for some time (6 month old tank) and I’m starting to win. This deep purple/blackish color stuff started showing up in its place in lower light areas. I manually brush off the rocks weekly and this stuff doesn’t come off with a light brushing

D06E4A86-923F-4D95-9F2A-3789D69E2257.jpeg
 

Jekyl

GSP is the devil and clowns are bad pets
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Can you please take a white light photo?
 

What Rim on a Tank Suits You? (Choose All That Apply)

  • Rimless

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  • Full frame

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  • Euro Brace

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  • All of the above

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  • Other (Please explain)

    Votes: 1 0.9%
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