welcome aboard :thumbsup: ... (post your growing pics and questions, in the Growing sections, for best results) ... looks like you may either be feeding your plants, or soil may be too 'hot' ? ... just a guess ... don't fertilize cannabis until it is a little older, I wait until 3-4 sets of branches have grown out, and then use half-dose nutrients ... varies by strains, but a lot of cannabis tends to be a light to medium feeder ... also, move your lamp closer, lessens the stretch, but watch the heat ... good luck :smokin: