Leaves going dry/yellow

Light Burn/stress lower the light power or hang it far away and lower EC

I think it has something to do with the climate in the first place. Where does the used air go? I needs to be blowin outside the growroom. To another room or better outside the house. And also: how strong is your fan and does it blows directly on the plants? Then on the other hand you try to feed them and i also think your ph is messed up somewhere because of this. So make sure the climate is ok and for this grow it depends on how long they still have to go. If it’s a longflowering you could try with a good topping of wormcastings and just clean water. This wil stabalise your soil. Maybe in the future you should try organics. Hoor soil, bigger pots and all natural feeding. A good soil is key and like this you don’t need to messure any ph. If you use something we call out here as “buffertabs” its these feeding blocks you dig in the soil. You won’t have any problems in your soil. Just make sure tabwater not to use directly but let it stand for at least a day.

Definetly over fed and severely burned.

Over nitrogen new leaf growth yellow on tops lower dark green. Under the bottom leaves would yellow first. Over the top starts to yellow. But that’s just off the little info and picture. There could be some other issues lighting/temp/ph

Nitrogen and potasium burn or wrong ph ( too low ) and still too much food.