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.
 

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