Start fertilizing it - but start slowly, give it 1/4 strength, then 1/3, and so on, gradually increase it to full strength but check on it's condition as you do. A general purpose 20-20-20 (N/P/K) fertilizer should work fine for you.

You shouldn't have to worry too much about the plant being close to the light, since it's a florescent - they don't give off much heat. To verify this, hold your hand between the plant and the light (cast a shadow with your hand). Hold it there for about 30 seconds - if your hand gets hot then you were right and the plant should be moved away. Doubtful you'll have that problem though. I'm running 440 watts through 4 48" florescent fixtures and there's next to no heat even right underneath them... but then again I do have an exhaust fan for the light system so that helps.

Check the pH as well, as Skateboardingpunk420 said although I doubt it's a problem if you havn't fertilized yet and used a good soil - hopefully addded some powered dolomite lime as a pH stabilizer?? Fertilizing lowers pH so be aware of that. You can pick up an electronic pH tester for a few bucks at a garden store - I got mine at Walmart right at the end of the season.

Water shouldn't be a problem unless there is something unusual in it - generally if it's safe to drink, it's safe for plants. You can give it a shot with distilled and see if you get any better results but I'm betting the fertilizer will work the best.

Oh yeah, and get rid of that aluminum foil. It sucks for reflecting. Get mylar or some cardboard painted with several nice coats of ultra flat white.

The plant looks pretty good for 2 weeks - I have one that about 1.5 weeks - only has one set of leaves, so I'd say you're doing something right.
psilocybin Reviewed by psilocybin on . first time grow - leaf problem hi, this is my first grow, that baby is about 2 weeks old. The first set of leaves started to become yellow about a week ago, but I didn't bother too much because they will fell off anyway, but the first true lieaves had started to yellow at the edges. I moved away the lamp(1500 lumen CF cool white) a little bit and the second set was not yellowing anymore . but now the first set has become brown and the second one is becomeing brown too at the edges. why is this happening ? maybe I should Rating: 5