First off, that pot is way to big for that little plant, get it into a smaller one, if you dont, the roots will grow huge, the plant will stay small, and re-potting will be a bitch... like.. you will have to find a huge pot next re-potting, just for a small plant.. which wastes space...
That brown stuff on the leaves is either heat stress, mg deff. or light nute burn, so if i were you i'd flush any remaining nutes out of the pot and add some epsom salts.. if it continues to burn, either move the light away, or add some ventilation, and get a little fan blowing across the light.. just so temps should drop a little.. (make sure the fan goes off at night)

hope that helps... i think it mostly looks like heat stress and over-watering, but i cant be certain... - good luck...
Abattoir Dream Reviewed by Abattoir Dream on . Brown leaf edges.. What's the problem? Hi I got this plant from a friend and I think it was overwatered since the leaves are all curled. I transplanted it a little over a week ago but I have not noticed much growth. I water it maybe every four days since it's in a big pot. I'm using a good organic soil and I have 3 cfls and an exhaust fan. I'm wondering about the leaves because I've noticed the edges of my new growth are brown (red) and some of the lower fans are getting brown in the center but not the edges (blue). Any help is Rating: 5