Update. The plants were not responding to anything we tried. So I decided to go back to tap water. Took out the chlorine, added hydroguard, calmag, and then 300 ppm of floraduo. Not much happened. So being close to death I said I'll try one more thing. I pulled the plants out put a 6" air stone at bottom of tank. Then a 6" cylinder air stone in the basket put in the hydroton and plant and filled that bastard to the top with water. And I mean you can see bubbles in the top of the hydroton. The plants shot up two inches and leaves spread open. They drop the reservoir about an inch of water per day. Roots shot out 2" over night. The ph is between 5.3 and 5.8. And raised humidity from 40% to 60%. Water Temps still pushing the limits. But not causing a problem yet. Trying to keep tent at 70°. We shall see...