Calcium deficiency?

Going to agree with AsNoriu here... PH issues always result in deficiencies of one or another nutrient or micronutrient as they can only be absorbed by the plant if the PH is correct. If the PH is NOT correct, no amount of nutrient/micronutrient that you may give will be absorbed or utilized. Do a good flush and then make sure you're feeding/watering with properly PH'd liquid... should be between 6.0 and 6.8.

But path here could be other too, I see edges burned evenly on some , so : Excess of nitrogen with or without already mentioned possible issues, that led to calcium lockout and we are here ... Actions are still same ...

Most probably, to me it looks like common mistake of wrong pH. When that happens, you can lockout some nutritions - in your case calcium and then leaf just burns out from intense light. Sort your pH ! If soil don't flush, just let dry out before each 3-4 plain waterings, if after that you still have time - feed them. Good cycle wet/dry/wet/dry is second after pH . If Coco or hydro , you know what to do ;) I was lazy to calibrate my expensive pen, thinking he never lies, but instead of his shown 6.3 it was 5.7 - aftermath in my most recent diary and it looks the same . Leaves won't recover, I would recommend even to clean them, but only after girls will start to drink regularly and constantly.dont touch any buds while do this. Good luck !

Hi, I think it's potassium deficiency. I think it can be cause by a deficiency of calcium or magnesium as these are needed to process potassium. I'm not looking at your feeding schedule so I'm saying this guessing you're not overfeeding. Increase potassium and cal mag and check the PH of you're water before watering the plant. Should be around 6.5 if you're using soil if coco or hydro it's around 6. If you think you're overfeeding don't increase doses just flush with 6.5 pH water. Good luck.