welll, you know the first two little round leaves of a seedling? not the serrated ones, but the round ones, well they are curling up and going yellow, and i am not sure yet but i think my first two serrated leaves and going a tiny bit yellow at the tips. help???

ive now reduced the light to one cfl, 6500k 18 watt bulb. my lighting schedule has been 24/0 for entire time of growth.