Brown and green algae

[Wayne]

Other than water and rock what else do you have in there? How old are the lights? Are you using any GFO?

[HaZRaTTy]

Have you just noticed it during the spring? The word on the street is that Edmontons run off gets high in Nutrients and Phosphates causing algae blooms.

Might just want to wait till the snow melts and the run off is gone before pull your hair out.

Not sure if someone can confirm or put that to rest.