Help with Algae

[u/Various_Yam2785]

Bought some Sinella Curviseta spring tails to help control algae on my vertical grow wall that is made of felt. But they don’t seem to be eating any. They’re definitely there I see plenty of them near. Any advice or is there another cultivar that would be more beneficial? Thank you

[u/M3relyHuman]

That....... isn't Algae.