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 MOST OFTEN MAKES YOU REACH FOR YOUR CAMERA AROUND THE REEF?

  • Coral behavior (feeding, extension, or movement)

    Votes: 1 4.8%
  • New growth or a color change

    Votes: 2 9.5%
  • Unusual fish behavior

    Votes: 0 0.0%
  • The whole tank looking especially good

    Votes: 8 38.1%
  • Something I want to document in case it changes

    Votes: 1 4.8%
  • A funny or unexpected interaction

    Votes: 2 9.5%
  • I usually put the camera/phone down and just watch

    Votes: 3 14.3%
  • Other (Post in the comments)

    Votes: 4 19.0%
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