I was only running my
lights 12/12 but increased today to 15/9. The only other factor that has changed recently is it's been warmer here in central Florida. This unit is running in the garage and for the previous 2 weeks, the garage was 60's/50's. This week it's mid 70's. I have a 1/3 chiller laying around and will eventually plumb up my closed-loops design for temp. control in all reserviors.
With warmer temps perhaps, the basil is growing faster. Lettuce seems some signs of toxicity @ .8 EC on the new leaves. The cabbage in particular and not the broccoli, shows the limp bottom stem.
I carefully pulled back the rocks on those particular plants, and the roots look a shiny white with very fine hairs streaming off. Their EC is 1.4.