ph 6.1 6 weeks fog 50% Celsius 24 Yellowing of the...

What Canadian says. When your giving max nute you need lots of light and a perfect environment otherwise it's to much. Less is always best. Cheers

sorry, one more possibility.. plants will shed a leaf or two.. no big deal if it doesn't spread. may want to hold off on first suggestion.. see.. i rarely say it.. but, if it spreads, do it.

just sucing nitrogen from below.. you could probably feed more... depends on other factors... or, just up the portion that carries N... in flower they are pickier and demand more. you're likely giving more intense light in a shorter period of time, so it's a different daily rhythm, i'd assume... anyway, maybe a slight uptick is best, and i rarely say such a thing.

I'm not too familiar with that line of nutrients but 18 ml per gallon looks extremely excessive especially considering it is an auto plant meaning they do not require much nutrient and if you do you use lots of it you can cause a nutrient lockout of the plant that will start to show as deficiency but in reality means a soil to hot bread to eat anything so it starts taking nutrients from older leaves. I also noticed you are not using any calmag and because the pictures are only the full plant and you don't have some shots of the leafs is hard to tell if it is calmag or if it is actually a nutrient lockout. Hope this information helps you out good luck with your garden

My guess is you need to supplement some cal mag. Especially if your using tap water. Or it's just self pruning some leaves. Happy growing!