I think this is going to be a magnesium deficiency? My Afghani kush did the same thing towards the bloom phase.
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Started a couple bagged Afghani seeds and one Tangie strain. I tried to "supercrop" the Afghan and failed, snapping the main stalk. Immediately placed main stalk in a Rockwool cube to take root. What's left of her is still trying to grow so, that's a good thing! All about learning right now...