It looks like a nitrogen overdose ease up on the grow feed and it should start recovering im not a 100% about the leaf going crispy on the edge but the leaf is too green and waxy with a little curling down which from past experience always is too much grow feed maybe feed it with bloom for a week or two and it'll lower down or a quick flush will solve it
Edit : looking back you're probably not using grow feed in bloom so flush will be the answer
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