Powdery mildew?

Ah, no you didn't eliminate it if that's what is was. PM has been here since before the dinosaurs and isnt going anywhere..except where you definitely don't want it. Perhaps a few spores found a foothold overnight (your high humidity day) and that was the end of it. A baking soda spray top and bottom of every leaf and then ventilation to get rid of that extra humidity fast. If you're worried cover the top of your soil/coco so a whole bunch of the spray doesn't get in there and upset the PH of the soil a whole lot. Expect some change, and be ready to deal with it.
Your grow looks ok though for now. Hope it works and you get your meds right. GG
 
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