Is it normal to see so many leaves dying incthe middle of flowering period?

Mate i just went through your grow journal ; what i could say is pure underfeed!! You are not even feeding half what your plants need at this stage!! Either your ppm/ec meter is not at point or your base water already has higher ppms givinig you that 800 ppm with 2ml of nutrients mixed!!would say up your dosage and you shall see difference in 3 to 4 days max. Also control your ph to 6.2 to max 6.5 and they shall bloom better.

Need to know what medium u using and 10 inches for light distance is way too close. If u using soil, pH 5.9 is far too low. If using coco, up it to pH 6.2 and recalibrate your pen

I would double check your ph calibration on whatever you are using to ph your water. It looks to me all of your plants are having PH issues. This could explain why your seeing the plants lockout there nutrients and eat themselves. Also maybe some heat stress as well. The closer they get up to the light the warmer it will be, and your temps are on the max side for sure, maybe why your seeing the top half’s of the plants curling there leaves and yellowing as well. Hope you can figure this out soon, she’s looking rough. Good luck. Cheers💨

But u can sure remove more then half of those lefs like 2weeks ago.....lolipoping aka deformatiom

Well..can be like 10reasons why are so yellow.....