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I made a post a few months back asking for help with a plant issue i have been plagued with for years. I received many helpful suggestions from users and adapted my grow to those suggestions. However my issue doesn't seem to be resolved. Basic info: coco, autowatered 4x daily, drain to waste...

I have been struggling to figure out what is causing this ever since I started growing. It has occurred every grow. 5 so far. I make it through veg with nice happy healthy plants, switch to flower and within 2-3 weeks these spots start developing. Typically on lower fan leaves first until...