Regarding plant #2. Leaves seem really deformed. Very thick canopy, very short, abnormal leaves? And then what to do with it? Continue to grow? Cut it down?
I had a leaf starting to do that on mine and I believe it was the light being too close or wind burn. The tips of the leaves on the top of that plant are just starting to curl up too. Maybe move the light up an inch or two or move the plant away an inch or two?
Hi!
Don't cut it down! Nothing to worry about here.
Those lower abnormal leaves are pretty common 'cos leafs take damage easily when they are still tiny and what comes to the discoloration I'd say it's magnesium deficience so maybe foliar feed some epsom salt (Magnesium sulfate)