algae prob

In general how bad is algae for the root system?

Not good at all get rid fast...

Green stuff, very bad, like nosmoker said, get rid of it. Clean all your gear, bleach even. Some H2O2 on the green, and then cover it with something...sand if soil, hydroton if hydro.

If it's white, not so bad, you can use a root treatment like SM-90 and/or Piranha, H2O2 also works.

Good luck

Green algae is getting light somewhere if hydro.