Oh looking at this brings back memories of last summer. Most of my crop when like this. When the pigment on your leafs goes the close/higher your light it burns the leaf like that. My whole crop was like that last summer. My heat was crazy between 32-35c so I had to use co2. But, when I was sleeping I'd turn off the co2 completely and the co2 dipped below 350 a few times and the leafs were burnt to s..t like that. I still got some amazing strenght in my bud. Lost a lot yield wise but, overall a massive learning experience.
Good luck with your next
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