With plants that small I would hope no nutes were used and it appears you have a moisture stress problem. Read UB's thread on Moisture Stress and you will see the big picture. Peace!
so for about a month or when your plant shows it needs it nutes shouldnt be added. temps should be 70-80 F. when you water only do it when its dry 1-2 inchs into the soil you can test it by just sticking your finger into there and seeing if its moist at all. this does look like to me a heat issue
soil is natures mix organic soil, lights are cfls daylight, they really dont get that hot, not sure about humidity, i have a bowl of water in there to evaporate, no nutes have been used.
ph would cause color change and other things, mainly chlorosis. If the PPM's arent too high, oor the temps not too high then I would agree it must be moisture stress. Check the PPM just in case. Thats the kind of problem you want to catch ASAP..............
I'm leaning towards moisture stress like DertsyBoy pointed out though, i need to check out that thread
man you guys were right i didnt think those cfls got that hot but i went and bought a thermometre for 2 bucks at walmart and it turns out its almost 20 degreees too hot in there will adjust and all should be well. Thanks alot everyone.