Whats this black thing on my hammer?

PMReef

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Hello does anyone know what is the black thing on my coral?
 

HAVE YOU EVER KEPT A RARE/UNCOMMON FISH, CORAL, OR INVERT? SHOW IT OFF IN THE THREAD!

  • Yes!

    Votes: 32 45.7%
  • Not yet, but I have one that I want to buy in mind!

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  • No.

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

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