Quote Originally Posted by PhatJay
Do you have a fan circulating air around the grow room? (in one of the pics in your 1st post it looks like you have one in the background). The curling right at the edges of the leaves can be a sign of transpiring. Not sure about the curling of the whole leaf. I had some curling right at the edges of some of my leaves, improving air circulation seems to have helped.
You used the word "transpiring" like it was a negative thing. Without transpiration the plants would be dead NOW.
The curling is probably a cal/mag def. sign IMO.