couldnt help but to notice all the poor advice u been gettin in this thread, u should be much further ahead in ur journal
first off, nothing is wrong with using MG as ur soil, dont pick out any "white things" in it bcuz they have NO NUTRITIONAL value to the plants. the perlite is what helps air get to the roots, in some hydro setups it is what holds the water in place for the roots to get to it.
In MG U will notice little "balls" in the soil, thats called oscomote, they are time release capsules, they release after about 2 months OR after about 30-40 waterings. in the meantime u should just feed them water. in a few weeks U WILL need to add more nutes bcuz the MG nutes wont have kicked in yet.
U only need about 2 cfls over those tiny seedlings, think energy consumption, "think green"