How close is the light? Leaves sometimes curl to try to escape heat. Mine were doing that the other day and I moved the light up and they've straightened back out
its not warm in my tent my air cooled reflector and fans take care of any heat issues. I will try misting but i don't think that is the issue as it has been rainy and overcast here for the past week and humidity must be high right now. Not sure which of my nutrients give me MG but i will check thanks.