2nd run in coco using gh 6\9 barneys tripple cheese, any idea what this is?

2nd run in coco using gh 6\9 barneys tripple cheese, any idea what this is?

Barney’s triple cheese fem 3 weeks from germ. Been using heads 6/9 gh formula. Gave them they’re second full strength feed last night. At least 15% run off. Woke up to 2 of the plants looking like this any idea?

also if it means anything, the plants were getting 24 hrs of cob led lighting for the past week. Last night I put them on a timer set for 18/6, and this is what they looked like at lights on. Any help is greatly appreciated.

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