Black cyano?

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Luis Figueroa

Luis Figueroa

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20170222_123557.jpg
20170222_123533.jpg

Never seen this before. Can someone identify it for me and maybe some advice on how to stop it.
 
AS

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WHAT’S USUALLY THE FIRST CLUE THAT SOMETHING IS OFF IN YOUR REEF?

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    Votes: 13 16.3%

  • A coral looks different or stops opening normally

    Votes: 49 61.3%

  • Water clarity or surface appearance changes

    Votes: 12 15.0%

  • Equipment sounds or flow seem different

    Votes: 9 11.3%

  • A test result catches my attention

    Votes: 17 21.3%

  • Algae or other growth starts changing

    Votes: 16 20.0%

  • I usually notice when the problem is already obvious

    Votes: 4 5.0%

  • It depends on what’s going on

    Votes: 16 20.0%

  • Other (Post in the comments)

    Votes: 1 1.3%
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