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Got it. Done. Thanks again!

first, thanks for the helpful suggestions. I immediately raised the light to 12" I'll need some time to filter some more RO water to address #2 - using this schedule... My meter only measures ppm, I will check out using an EC meter The 6.0 - 6.1 pH is my target, assuming accurate metering...

First post here and first attempt at growing RDWC - 32 gal total in two totes - one plant - 700 gph pump (yes, massively overbuilt ;-) Chiller - water temp stays between 60 - 68 degrees F 600 watt MH that is about 4 inches from plant temp at top of plant ranges between 70 - 80 degrees F...