Don’t have a clean up crew.
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I know it’s not cyano. I did the test thing . & it’s rock that’s painted that color.Looks Cyano bacteria, hair algae and other stuff.
Get a clean up crew.
How old is the tank set up ?
Hair algae, maybe diatoms since its brown in color or just heavy brown algae growth. But as @Brad Miller asked, how old is the tank?