I'm late following along, but I would guess the problem was no problem, just what plants do, drop lower leaves into flower?
Quite late but hoping to learn what I'm doing wrong. Just about like your problem here.At this point i had received my humidifier. Set to 60%. No trouble overcoming AC. Something was still not right. Purple stems like crazy, not really eating, thin stems. I had been following the cs target ph (although my plan had been to set to 5.5 and let it drift, my maxi scare made me decide to blindly follow), and their target ph for week 1 and 2 of veg were 6.2 and 6.1 respectively.
I diagnosed a k deficiency, and upon checking ph nutrient availability charts, i saw that the ph was making k unavailable. I lowered to 5.5, plants seemed to respond. Pics are dated.
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