Got some issues on these fast growers. I've been treating it as a cal-mag deficiency, however I've been feeding calmag for two weeks and its only getting worse it seems. Any thoughts? PH is 6.0-6.3, PPM 444 feed, RH 47-50%, Temp 77-81f. 
Hi I've noticed these things appear on some of my leaves over the past week or so. I'm not sure if it's powdery mildew or some other disease. Temp have been mostly 78℉ at night and 91℉ in day but humidity has plagued me with RH values of 70-90%. Can someone offer some help plz 
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