Snow White seedlings

Im new to this forum and have just started growing Snow White which i purchaced from Nirvana.The seedling are 7 days old and growing well but i am unsure when i should turn on the fan and for how long as the seedling are still small.Any advice would be much appreciated.

i would turn the fan on now.but dont have it pointed directly at them.just have it so there is air movement in your room that makes your seedlings move a tiny bit.and have the fan on a low setting.

Thanks very much resinousflowers.Much appreciated mate.