Weird substance in rock

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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
 
Can you please take a white light photo?
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

  • Yes!

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  • Not yet, but I have one that I want to buy in mind!

    Votes: 9 12.9%
  • No.

    Votes: 26 37.1%
  • Other (please explain).

    Votes: 3 4.3%
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