Pest eating my sps

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Kruss7

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This is precisely why I was asking about movement. When my birdsnest gets a bit too irritated like during water changes, some polyps will retract and shut tight, forming what looks like tiny black dots. They honestly look exactly like in the pictures provided.
I haven’t done a water change or been in the tank and my parameters look decent to me, but I won’t rule anything out. The issue I see is that it seems like there is some tissue loss.
 
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