Well i've tryed everything, i've set the PH to 6.0 and i've fed them lots of iguana juice it seemed to give them a lot more darker green but still did not remove the yellowish growth on the inner of the leafs. I also noticed the Feminized Master Kush is flowering under 16 hours of light kind of odd... I gave them some calmag but didn't seen to have any result. I dont know what info you would like please reply back.