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so zinc eh?? What a weird one

Yeah, and cal mag too sometimes. Does it look like mag to you? Thats what i thought originally but now im second guessing myself because it starts on the top of the plant and I read that mag is mobile.

Anybody know what nutrient this plant is deficient in? The markings start at the top and are the worst under direct light. Feeding with jacks 321 in coco.