What are these algaes?

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BlackZebrasoma

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So, I recently increased the Phosphate and Nitrate level of my aquarium. My phosphate is around 0.06 and my nitrate around 0.7 . Now a few days later I saw these algaes on my stones. I think these darker spots are Coralline but I’m not really sure. I really want to know if it something good or bad, so please tell me what you think:)

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