My plants are 8 days post sprout. I have been very careful not to overwater them. I have not fed them anything (nutes), the lights are CFL's and they are not too close to the plant. My temps are constant 65-80*, humidity is steady at 50-55%. I have them on 18-6. My water is aquafina spring water ph'd at 6.5 and my medium ph is 5.5 to 6.5. My closet is well ventilated. What could be causing this? Any help will be appreciated.

slight nitrogen def. start feeding

kp

Thank you very much