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It looks like Manganese or zinc deficiency.
Spotting Cannabis Deficiencies in Your Garden | CenturionPro Solutions
A cannabis deficiency can be a result of improper care or environment. Possible causes include pH imbalance, poor watering habits or nutrient deficiencies.cprosolutions.com
Do you check PH when you water? (I don't, but the linked article mentioned that.) Sorry, I'm pretty clueless when it comes to PPMs.
Water with rain water into organic soil so not concerned about PH in this medium. I did fertilize @500ppm of MC, which is a reasonably safe application of that product. Maybe i will go do a slurry test on the soil though.. even though other plants in the same medium are doing great. Off to slurry test now