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I have to disagree. Ive had a girl get topped by a thouwie before, and am familiar with heat burn, and that doesnt look at all like it to me. looks nutrient related, like a deficiency or lockout.
looks like DWC, right? whats PPM? what nutes? using RO water, or tap, if tap whats PPM/PH? looks somewhat like magnesium to me but I am very hesitant to suggest thats what it is, can you tell us more
Last post of the night and I am drunk. I might think zinc deficiency but it would depend on where the leaves are coming from. Mj is fond of zinc. Don't tell anyone. I want to start a thread someday that reveals this. High phosphorus could cause this. I think this because your leaves are getting white or brown areas in the central part of the leaf with the margins still remaining green. Peace to everyone.