things are not looking good.. doesnt seem like they grown that much. severe yellowing and the tips look like there burning.. havent messed with nutes.. just watering when they are dry, undersides are purple and im keeping them on 24/0.. should i give them some darkness?? i transplanted the bigger one with patio plus and perlite and turned the hps on (400w) trying to keep the soil moist, seems like they dry out really fast in the peat pellets.. im thinking they need some nitrogen, but i couldnt find a nurserie or any other source of N.. maybe one of you guys could figure out what im doin wrong?? thank you..