Unfortunately it's not just the canopy. This is how it looks down to the pot. They have been in flower for 7 weeks as of yesterday (10/17), i repotted 2 weeks b4 setting to flower, fed HastaGrow 6-12-6 the day i put then to flower. I was thinking pH, i flushed last week and it came out 5.8, got it back to 6.2, fed FlorsNove bloom at 6.5; there is no change in leaf color, stems are a little hard but not purple, just knuckling leaves that are mainly at the bud sites. I have them on the same routine as my MT which also had bad pH. I'm just wondering if it's one of those hard to grow plants. Maybe i crossed a (MT) cat with a (BK) dog and the babies came out mearking. My MT is doing fine.Temp guage about 6" below tops, day tempts have been as high as 103 in the dark within the last 5 weeks but air flow was steady. Last 2 weeks at +/-82 days, +/-81 with lights, 400w HPS about 2' above and two 4" 40 watt daylight delux floros on the floor. It's only these plants (Blueberry Tundra; my own strain) that look like this.