Nute lockout, or deficiency?

First week of flowering white widow... 3 days ago I noticed yellowing leaves. Today they spread from the lower fan leaves to the tops.

I'm using Promix Organic Herb and Veg soil. No nutes added yet. PH was always at 6.5 when watering. Run off was always 2200 ppm in that soil from veg.

How do I fix this?
 

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