My new sprout which is about a week old growing its 2nd set of leaves. The first set look ok, there is just a small yellow spot on one of the tips and im kinda worried. I had gnats kill a plant but they are long gone the sand worked awesome. I can put pictures up later. when i get home.http://i166.photobucket.com/albums/u97/nutmeg333lg/securedownload-1.jpg
Yea it gets water every 2-3 hours, 130watt flourescent bulb, in freaken miracle grow i know its all i could get, also inch n half os sand over soil to keep out gnats. It sits in a strainer bowl lined with foil with lgiht 3 inches directly above.
Looks Like nute burn to me. That soil sucks for seedlings, always burns, id rather use dirt from my lawn in a solo cup to start a seedling before i used that junk.
You should water only once a day every couple of days. Completely saturate the soil with water, then let it dry out for a couple of days. Like the rain cycle in nature.