Please Help - New Sprouts turning yellow and die

Hi all, long time reader first time grower. My set that i have is a Cool Cab from sunlight sheds. very nice set up. i started with northern lights and all seeds sprouted but like after 3-4 days the leaves are turning yellow and just dying. i started a few in rapid rooter plugs, a few in rock wool, and a few in jiffie cube #7 to see which way i would get the best results. i added only water to germinate under a few paper towels. i did try some half strength miracle grow soaked in all grow medium. everything i seem to try is still not helping?? Any ideas guys ?? Oh amd by the way, i did put all the seeds in the clone chamber in top of the unit under cfl. Should i go ahead and throw the MH light to them after sprouting ?? Im so lost and need help please guys thanks dudes

hey buddy the miracle grow has got to go get your self some fox farm nutes foolproof
also i would recommend switching to soil for first grow soil without nutes iwould let them go a week or so before the big lights come on