Manganese excess. Stop using so much nutrients to stop it. Allow medium to dry and flush, afterwards use less nutrients. Do you Have a Manganese Deficiency in your Cannabis Plants?
Good looking plant overall. I do agree with above as she is a little dark. What's your feeding schedule like I attached a photo I keep on hand also.
I was gonna say calcium deficiency, semi mobile nutrient. spots happen under the lights first then move throughout if it progresses