Coral disease - dark brown rings on Toadstool Leather

brucelee90

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Hi guys, need ID on these dark little brown rings on my toadstool leather. They're spreading really fast.

pest-id-1.jpeg pest id 2.jpeg pest-id-3.jpeg
 

TCoach

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If the polyps of the leather are out, I would not sweat it. My leathers always retract when irritated. So based on them being out, I would not worry too much.
 

High pressure shells: Do you look for signs of stress in the invertebrates in your reef tank?

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