What is this brown stuff?

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ChickReef

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What is the brown on the rock? Is it bad or good?

E352017D-5E86-4E81-9982-C34244186019.jpeg 6DE2B580-8BCA-4EB8-9017-D4F70F1F8FD4.jpeg 93A5F49E-59F7-4190-A663-046AC9A45730.jpeg
 
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KrisReef

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Appears to be some kind of tiny polyps? Clavularia species?
 

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