The lights (3 x 1000W) are on 18/6. Got an air stone (18 inch) in the resevoir running constantly. PH is 5.8, TDS at 850ppm, water temp is 70 degrees, room temp 80 degrees....plants are almost 2 feet tall growing almost one inch a day with no signs of trouble. Everything is dialed in perfectly, IMO, except for the watering interval.

I'm starting to think that I'm shocking the roots by letting them dry out too much before their next watering. I'm going to return to a more frequent watering (every 4 hours) and see if there's any change. I'll keep ya posted.

Thanks Zandor just saw your post as I was typing this. I'm using hydroton in 2 gal buckets.

GM