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[Luke_e]

Friend of mine wants to know what this is on his leafes. Any ideas?

 

[RYO]

Eeer algae
looks like black brush
http/www.aquaticscape.com/articles/algae.htm

 

[Luke_e]

Thank you. I'll let him know.

 

[riverman444]

Yep, black brush algae.

 

[Themuleous]

Is it not hair algae?

 

[Luke_e]

Thanks for all the replys, i've told them its brush algae, but i've also let them know it could be hair algae.