hey guys, im somewhat new to growing. i grew 2 times before but i dint really know what i was doin and i didnt finish the grow. i have 3 seedlings and they all are pretty yellow and the leaves are pointed up to the light but they arnt stretched out at all. plus i have a 400 watts high pressure sodium light on them which i keep on about 12 hours a day. and i have 4 26 watt cfl lights on them 24/7 but they are 27k bulbs. i only keep the sodium light on half the day cuz of electricity and heat. i have them in cut off 2 liter bottles right now till i transplant them. they are in Scott's premium soil. i water them like every 3 days when the soil gets mostly dry and i havnt used any fertilizer i dont have a Ph tester or anything. i dont have any food either. im pretty broke right now cuz i just had to spend a lot of money on other stuff. does anyone know what would cause my plants to be so yellow? they are MUCH yellower than in the pics. i had to use my cell phone that takes crappy pics. i need some advice. they seem like they are doing so good besides being yellow also since im on a budget, if i only had $20 to spend what to you think i should buy? new soil? food? ph tester? also the only place i can go to get stuff is walmart or kmart, and i dont have a CC to order online. so i cant get like foxfarm stuff. THANKS!