Are they raised bumps? Or just black dots ?
I bet you it's just from rubbing up on corals... it's very common. Mine get it from time to time, there was just a post not too long ago as well in regards to this.
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20g BB Mixed Reef // Coralife 150w HQI // AquaC Nano // Koralia 1 & Seio 820 // Jager 200w // AC50
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