cfl grow leaves curling help

Soil- FoxFarm Ocean
Co2- Homemade
Fan- 2 pc fans(120mm) and one small wal mart fan
Lights- 8x 26w 6500k 1x 23w 2700k
Strain- Blue Mystic (Nirvana)Feminized
day 10

Temp: 70 at night to 86 during day 81 avg
Humid: 30-40%

18/6

can anyone diagnose my plant?
watering every 2-3 days.

pH problem

you were correct thanks for the help i neglected the ph.

ph was at 5.7 is that really that bad? does it have to be right on 7ph?
I added ph UP in the watering hopefully they recover.