What is this?

Tomb85

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Hi, I have this appearing on rock work started of as little black
20240320_151552.jpg
dots everywhere now a bigger patch here. What is it?
 

KrisReef

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Sponges? Coralline algae? The picture is unclear but either is a good candidate.
 

When to mix up fish meal: When was the last time you tried a different brand of food for your reef?

  • I regularly change the food that I feed to the tank.

    Votes: 45 21.3%
  • I occasionally change the food that I feed to the tank.

    Votes: 73 34.6%
  • I rarely change the food that I feed to the tank.

    Votes: 70 33.2%
  • I never change the food that I feed to the tank.

    Votes: 19 9.0%
  • Other.

    Votes: 4 1.9%
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