Dont worry too much about light on your seedlings. Once you get to the 3rd or 4th set of leaves then bump it up. You want to be using 5500K - 6500K CFL's for veg growth. For one plant maybe two to four 23-27watt bulbs. Keep them CLOSE to your plants, like 2-3 inches away otherwise they will stretch and become thin.
Like people have said, get rid of the foil and just paint it FLAT white, or find some mylar film to line it with. Paint is simple and cheap though. Good luck brah
And dont worry about using miracle gro soil, its fine. It most likely wont produce as much as foxfarms, but if you do it right, youll still have smokeable buds.