What is this this red algae

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DEE’S reef

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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WHAT’S USUALLY THE FIRST CLUE THAT SOMETHING IS OFF IN YOUR REEF?

  • A fish’s behavior or appetite changes

    Votes: 10 15.4%

  • A coral looks different or stops opening normally

    Votes: 42 64.6%

  • Water clarity or surface appearance changes

    Votes: 9 13.8%

  • Equipment sounds or flow seem different

    Votes: 7 10.8%

  • A test result catches my attention

    Votes: 14 21.5%

  • Algae or other growth starts changing

    Votes: 14 21.5%

  • I usually notice when the problem is already obvious

    Votes: 3 4.6%

  • It depends on what’s going on

    Votes: 11 16.9%

  • Other (Post in the comments)

    Votes: 1 1.5%
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