i dropped my ppm about 50 when I first noticed this, because I knew it was a litlte bit higher than my normal methodology. I want to say some side tips of the first 2 fan leaves have gotten a bit yellow though over the last 12 hrs so maybe some more fresh water. just wanted to confirm, this is nute burn and not heat stress? the tips that look yellow are definately curling down a bit too. http://www.anarchs.com/val/micro/YellowTip1.JPG http://www.anarchs.com/val/micro/YellowTip2.JPG this also began about a day or two after i began foliar feeding.. and ill be honest I am doing it more than twice a day.