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That's a good thing. When you go from seed you will get plants with ph tolerance difference. Your grow isn't even looking bad buddyOk this is def a manganese deficiency...my leaves look exactly like this...
https://www.growweedeasy.com/cannabis-plant-problems/manganese-deficiency
Prob because of my pH issues pretty much the whole grow up until a few days ago...I didn't realize how critical it was to have pH 5.8 going in. Was feeding anywhere from 5.9-6.2 most of the grow...didn't really show any issues until a few days ago. Surprised only 4 of the 18 are hurting. So far at least lol...weird that the ones showing signs of this are the ones with the most buds so far...maybe that's not weird lol...
The deficiency almost always happens when ph isn't in range.