whats up FAM? Okay, first of all, you need to veg under 18/6 18 hrs lights on and 6 hrs lights off. I cant tell what you said, but if your growing an automatic strain then hell ya bump the light up to 24/0 so you can get full potentail out of the auto strain, lol.... The brown spots could most likley be a mag def, but cant really tell from pics. Oh and get a fan, you dont want to burn them seedlings up.... Cheers, happy growing....
Put lights 12" away from canopy. Personally, if those babies would mine they would be under cool white cfl's until they looked a little older.