It looks alot like a calcium deficiency to me. Ca def. usually shows itself on the outer edges of the leaf like what you have and "browns" it's way inward toward the leaf stem where it meets the plant.
Also remember that too much Potassium will lock out Calcium. This usually isn't an issue until later on in flower, but with any given strain ya just gotta run em to see what they want and when they want it, so even though it is unlikely that this has anything to do with high Potassium, I thought I'd throw it out there.
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