What is this brown stuff

Jake Tully

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I have no idea what this is. I am still cycling my tank and this is all over one of my rocks with tiny spots in 2 areas on another rock.

Live rock.jpg
 

High pressure shells: Do you look for signs of stress in the invertebrates in your reef tank?

  • I regularly look for signs of invertebrate stress in my reef tank.

    Votes: 36 31.0%
  • I occasionally look for signs of invertebrate stress in my reef tank.

    Votes: 28 24.1%
  • I rarely look for signs of invertebrate stress in my reef tank.

    Votes: 22 19.0%
  • I never look for signs of invertebrate stress in my reef tank.

    Votes: 30 25.9%
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