Brush, Fur, or beard algae?

AcidCookie

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So far this is only presenting on my Vallisneria, who’s not growing very well. It’s been 4 months and it’s never put out new growth or runners.
 

Colin_T

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Black beard algae.

Cut off the contaminated leaves and do a 80-90% water change and complete gravel clean each day for a week. Clean the filter too.
 
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