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Can't figure this out

I am growing dwc and as the pictures show I have yellowing leaves with rust colored spots. Initially I thought it might be the beginning of light burn as it is only on a few leaves at the top of plant. So I raised the light. That didn't help. So then I thought maybe it was a calmag issue so I upped the calmag to 3 ml per gallon. That doesn't seem to have worked. So I thought I would ask you guys. I am running a Growers Choice roi 420 for lighting. Air temp is 81 degrees and humidity is...

Can't figure this out


from Hydroponics / Aeroponics
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