Black cotton fur balls in gravel

[gbriggs1986]

Hello everyone this my first post
I bought new tank about 3months cycyled it for about 6weeksits a fluval profile 850 263 lts
I do a water change every week but now black fur are turning up in my gravel and seems to be getting worse i tryed everything to get rid of it but nothing seems to be working help plz

Cgeers gaz briggs

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[Mebbid]

Could you take a picture?
How long are your lights running daily?

 

[coralbandit]

Sounds like Black Beard Algae (BBAS/BBB)
Algae in the Planted Aquarium-- Guitarfish