Something to worry about?

Williamthegr88

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was looking at my coral and noticed a bunch of black spots don't know if it's a pest or polyps that receded
 
Here's a pic

IMG_20161211_183551623.jpg
 
I notice my encrusting sps does that when the polyps aren't extended. They usually extend the next day as long as there's no algae brushing it.
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

  • Yes!

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

    Votes: 9 12.9%
  • No.

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

    Votes: 3 4.3%
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