Quote Originally Posted by Raelum
I had a similar problem and it turned out to be humidity. The leaves would curl up and the stem would look a little white or pale (almost like it was shedding).

I just took out a fan and then put bowls of water around the plants so the light would evaporate it. Seems to be working.

You should keep your humidity around 40-60 percent.

I would also move your light a lot closer.

Good luck with your grow!

Would a daily misting with ph neutral water work perhaps?