Help! One week old Og kush auto seedling help..

[Dreambolic]

And ya that's not a rock.. As I told u its hot here and the soil drys up alot.. The pic was taken before watering
They r the cracks.. It's more natural soil here than a great garden mix.. Cuz we don't have good garden mixes.. But now I am planing to buy it from internet.. And it would be great if u suggest few good ones..
Also what kinda fertilizers should I use in vegetation stage.. Thanks