Hopefully you have things squared away by now, but I would also go with a bit too strong a nutrient feeding when small. Generally, if the browning/curling start from the soil up, it's nutrients and if it starts from the top down it's heat.
Fencewalker Reviewed by Fencewalker on . Brown edges and curling http://i634.photobucket.com/albums/uu69/ic3blink/Brownedge2.jpg http://i634.photobucket.com/albums/uu69/ic3blink/brownedge3.jpg http://i634.photobucket.com/albums/uu69/ic3blink/brownedge6.jpg http://i634.photobucket.com/albums/uu69/ic3blink/indoorsetup.jpg Clones have been home for two weeks since purchase. Fluorescent light 24/0 run off ph=7.6 Rating: 5