White circles on Live rock

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Zoacoral

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Can anyone tell me what this is? If its bad, how do I get rid of it?

 
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Are they little spirals?Probaly just a type of feather duster completly harmless
 
I have never had any problems with them. Odds are they will never hatch, I believe they need brackish water.
 

WHAT PART OF LIVING WITH A REEF TOOK YOU BY SURPRISE?

  • How much space the supplies and equipment take up

    Votes: 11 42.3%
  • Salt creep, spills, and cleanup outside the tank

    Votes: 3 11.5%
  • Planning trips or finding someone to care for the reef

    Votes: 7 26.9%
  • How attached I’d get to individual animals

    Votes: 2 7.7%
  • Making decisions when there’s no clear right answer

    Votes: 7 26.9%
  • How much the reef affects everyday household life

    Votes: 6 23.1%
  • Nothing in particular, I felt well prepared

    Votes: 1 3.8%
  • Other (Post in the comments)

    Votes: 1 3.8%
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