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Questions Anybody know what this is?

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Started a new run. 20 days since I planted seeds. The pics are from an Afghan landrace seed. Humidity has been real low around here(30 to 40%). My wick humidifier hasn't been functioning well, so I started using my old school humidifier which tends to leave a white film on everything due to the hard water around here. I did do some misting early on and thought that maybe it's residue from the hard water. All my seedlings show some sign of this, but this is the worst leaf of the bunch. Doesn't seem to appear on the newer growth. Doesn't "wipe" off. Powdery mildew? I obviously have no idea.

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