√Auto-Zkittlez ×2 (Blackskull)

Looks right on for 2 weeks. I run 18hrs of light for my autos, but you can do 20 as well. I stay away from 24hrs of light as the plants need some darkness to rest. Happy growing.

Looks like you need more Nitrogen. Nitro deficiency starts showing in the lower leaves as nitrogen is a mobile nutrient. When there isn't enough in the soil the plants takes it from its lower leaves. You may want to check your feed amounts and adjust them. Happy growing.

Diatomaceus earth on the soil, safe and effective for bugs. That kind of yellowing seems to be Nitrogen, I think you should be feeding a veg nute and not correcting ph, soil is forgiving as long as you keep it below the labeled percents. Keep on the great care! Happy smokes!