Sorry... Your plants are stretching a little. 3 days from sprout, they shouldn't be any taller than about an inch...And, that halogen lamp is pretty much worthless for growing... They give off way too much heat, and the light spectrum they emit doesn't do much for compact growth. It will cause your stems to stretch like a mofo.

If you cannot afford a real HID grow light such as a metal halide or HPS, you should think about building some kind of multi-bulb CFL fixture... You can get the parts from Home Depot, and you'll spend less than $50 to do it, bulbs included. There are "Daylight" spectrum CFL bulbs that replicate the sun's rays... They work GREAT!
They'll help you keep your temps in the mid to high 70's, and your plants should thrive in those conditions.

Be sure to provide some fresh air intake, some exhaust to remove hot stale air, and some small oscillating fans to give good air circulation.

Be careful with the Miracle Gro soil... Those little plant food balls will create hot spots and can give your babies nute burn.

As far as watering goes, if your soil drains adequately, you should just give them a good deep watering every 2 or 3 days, making sure to pour the excess water out of the runoff dish. Let the soil dry out real good between waterings. Doing it this way will ensure the roots receive adequate oxygen.

Think about how it works in nature... It rains, then it dries out for a few days, then it rains again, etc... Try to replicate nature as closely as possible.

That's the best advice I can give you.

One of the last plants I grew was a WW... I vegged it for about 2 weeks & then switched to 12/12... It was about 4 inches tall & on its 4th set of leaves...
By the time it was finished, it was almost 2 feet tall of solid bud.