Nutrient solution is 3 gal. Plants are drinking .75 gal/ day. At that rate, the solution is cycled every 4 days or so. Yes, reset res swap is done every 7 days. RH is 50%. Temp min max are 74: 77. Solution temp is 66. 35W air pump w/ 9" air stone in each of 4 buckets. I have 4 cultivars in one tent. This issue is happening with three of the four. Hydoguard through entire run.
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