What is this this red algae

DEE’S reef

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So my tank was set up in mid December 2025 and has been running for 5 months and I’ve seen some red on my rocks and sand but when I lifted my back of my lid and saw my top rock was getting cover in some sort of red algae. Should I be worried and what should I do to treat it.
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Hi, that’s Cyanobacteria
 

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