Thanks, i had the same problem with a reservoir at my cottage and wrapping it with black tape did stop it. But i actually think my plants like a little algae water.
Yeah those algae should be good for the plants right? I mean aren’t kelp and algae related? At least it couldn’t hurt. DEFINITELY NOT A BIOLOGIST.
Maybe you can grow them in a couple of jugs and dry them and turn them into powder and voilà, you have.. well something.
I run 1" PVC from a pump in my RO tank along the wall feeding manifolds with sprinkler heads buried in my beds and even though they are white, light penetrates through the PVC. When this was brought to my attention I tore everything down to to replace it with new blacked out (spray painted) PVC.
Im no biologist either but I like to err on the side of caution. I would clean it out or replace it & black it out.