you're gonna need at least 6 42 watt bulbs for that amount of space. keep the light 1 inch away from you're plant and they'll grow nice n bushy. if you want to strengthen the stalk w/o buying a fan bury them up to the baby leaves and 4-5 times a day flick it gently, so it sways around a little.
they're very VERY stretched out. i'd rip 'em. get everything, and try again....