Something really wrong is going on..it has to be either soil or lights, I say this because when I first tried to grow I didnt even take the pH of my water, I just poured it and let it sit and water the soil and within a few days I had a sprout..so if I can do this without even any form of HID light or anything you must be doing something really wrong. Try to get a mixture...doesnt have to be soil..I hear all soil contains nutrients so I'd just go with like what ready-set-gro said..1/3 perlite, 1/3 vermiculite and 1/3 peat moss and wait and see what happens. And this time try to water the sprouted seed in a small pot and leave it out of the light. Seeds dont need light to pop out of the soil, once it does then put under light..If I could get the embryo leaves to show from the sun through a window then I know you can get those seeds to grow with your good lights. I say this because they can grow just as long as the lights arent too close, I dont think youngin's need all that light .