What is this on my sand?

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My tank is pretty new, so i think they're diatoms but im not sure. They are dark brown, kind of translucent in person, and they have hair on them? Just wanting to know what the best course of action is here.
Screenshot 2025-05-30 at 5.53.44 PM.png
 
Tidal Gardens
looks like cyanobacteria
 

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