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Thanks for the reply Johnny. Our feeds are all organic, mineral extractions. We do run relatively high temps, and C02 but also a pretty high RH which keeps VPD lower and I believe slows transpiration rate. The thought may have merit in so much as the room with worse symptoms has higher Co2...

That sounds about right, debating whether or not to add any N this late in the game, my feeling is little or none, damage it done. Thank you for your response Deadstill

Here are some plants in week 7 of flower ( ~9/10 week strains ) they are in a greenhouse under 1000W double ended HPS in 5 gallon containers is a nice soil mix from a trusted purveyor. Irrigation water source contain is well most notable thing about it is ~120ppm of calcium not knowing...