look like hair algae, you can manually remove it using tooth brush. Yamato shrimp eat this algae as well. Sechem florrish excell side effect work wonder on Black beard algae, not sure if it is effectiveness on hair algae :P .
If you don't mind taking it out from the water, you can use bleach or hydrogen peroxide, just make sure clean it properly and soak with lots of anti Chlorine.
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