I've been growing some northern lights for about 3 weeks now and I think it has an N K P problem because I havn't fertalized at all yet. Its under 2 cool white bulbs about 1/2 inch away from the tops. Do you guys think it just needs some fert? Only the lower leaves are yellow some spots, slight red stem, and tips seem to be browning. Do they look stretchy? And can you rais seedlings under a 400w MH?