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Necrotic spots in DWC

My leaves are 75F top, 76F bottom. Humidity is 60% on a controlled system verified by a hygrometer at each end of the tent. VPD=1.14 RH could be 65-70, might change that 🤔
 
I suspected so. I have given my plants a dilute cal mag spray once in the past with no ill effects. It was a bit of an experiment. :)
 
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