Strange crystal like substance

[H8plow]

I just noticed this yesterday on different leaves. It wipes off easily, and does not move. I am pretty confident that it is not an insect.
I’m in the 5th week of flower, have not had any pests, I have an ipm in place. This is an indoor grow, avg day temps are 83f avg humidity is 61%, avg vpd is 1.2. Night temps are 72f, 67%rh, vpd is 1. I have a humidifier, two oscillating fans, and a dehumidifier in the tent all being controlled.
I do not think it is PM, but I could be wrong. Any help on this would be great.

 

[Citadel]

67% rh in the 5th week of flower? Should be more like 40 man could be the start of powdery mildew wait for a pro tho.

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[H8plow]

Yeah, the last few nights we have had some really humid weather over here at the beach. I have an 6” exhaust fan running all night, with both oscillating fans going in a passive intake grow tent.

 

[H8plow]

67% rh in the 5th week of flower? Should be more like 40 man could be the start of powdery mildew wait for a pro tho.

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I think it is calcium deposits from the humidifier.

 

[Citadel]

Switch the humidifier off you don't need it in flower mate.

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