one of my 9 plants has these spots showing on it's leaves... based on the pics in the faq, it looks like light burn to me, and at first i thought it might be, as i've been experimenting with keeping my lights about 10 inches away from my plants for the past several days, but it's not even the closest plant to the light, when i place my hand at the top of the canopy, the light doesn't feel uncomfortable on my hand, and none of the others are exhibiting this problem. additionally, some of the lower leaves of this plant are showing this problem, so i'm inclined to think it's not light burn, and maybe nute burn. the sprouts were planted about 40 days ago, and i started them in miracle grow, which had time release ferts in it. when i transplanted them to new pots, i gently held the rootballs of each and gently shook as much mg out of them as i could before repotting in b'cuzz coco substrate, to which i added earth worm castings... i've been watering every 4-5 days since then. the first two times i used 2 tsp of fox farm grow big per gallon (total of 1.5 gall for whole grow for the past three waterings), and for the most recent watering i backed off and used about one tsp per gallon.