And inch is fine, 1 inch will defently not kill ur seedling. It will take just a lil while longer to sprout, but WILL NOT kill it, but I do not recomend digging up ur seed, let her grow and do her thing, and you DO NOT have to have light on it befor it sprouts, lol, the plant knows which way is up. Gravity tells the roots to go down, and the folage to go up, its mothernature. But u do however need to put light on it as soon as you see it starting to poke out of the soil...good light, not some 15 20$ light u bought at wal mart....