This doesn't look like a nitrogen defincy because it doesn't start yellow from the bottom. I am actually not sure what causing this. Ppm is around 800 with ph 6.3-6.5. growing in coco mix. Don't mind all the white stuff, those are just DE. These girl came back from preflowering to revegging. But when that took place in didn't see any deficny. Temp here in cal is roughly around 85+ degree
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I removed most of the yellow. Let hope i correct this issue. I switch the feeding to bloom and upped the ppm to 1400.