What are these red things on my rock?

Impavidus

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Out of nowhere I just noticed these red things on my rock. 3 of them are about a quarter of an inch, several other specs of red within rock. They are only on this small section.

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James M

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Since ur rocks are new it’s most likely the start of cyano
 

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

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