Air Q

Should I keep the air conditoner and fans on during lights out period for 12 hours of darkness? I was also if any of you experienced growers can tell me what powdery mildew is from? Pictures are around week 6-7 of flowering. 12x12 room under 1000 watt HPS SolarMax Bulb + Ballast, aluminum wing reflector. Feeding with Sensi Bloom package, Fox Farm, Using Roots Organic and Fox Farm Soils. And rockwool cubes for some of the mediums in the hydro table. I experienced and witnessed a lot of different things during this grow. I noticed during veg when I watered them frequently the roots came out and were white and when I stopped watering because I thought they were being over fed after eating like 6-12 times a day at 30 minutes each. Just some tips if you think your underwatering in your hydro table set up, you probably are not. I ended up burning up my roots when I stopped feeding them so much that they never recovered like they were when they first popped out.

Powdery mildew likes high humidty. Lower humidy and spray with a 25% solution of milk. Whats your RH?

no temp. gauge, any word on whether keeping the air on during the dark hours is a good or bad thing?

Keeping the AC on during lights out will help lower the RH and temps. The lower humidity will help you control the PM. And dropping the temps 10-15 degrees from lights on to off will make your plants feels right at home and improve how they finish......