CO2 levels are stable. No algae problems.
I did have problems with green water for a while. I did lots of wc, and changed some of my light tubes that had lots of BLUE spectrum (could cause algae probs), with tubes that have no blue.
Actually 2 x T-8's have no blue at all, but 2x T-5's have a bit.
Still, this did help a lot and water seem to be looking much better now.