You need more light, much much more light. That little bulb isn't putting off anywhere near enough lumens for adequate photosynthesis, and that's why your babies aren't growing. Spend a few bucks, get a decent 150 watt HPS at least, if not a 400.
Your plants will love you for it.

The mold is there because you're keeping the soil too moist. Allow it to dry completely between waterings, you can lift the pot and tell when it's feeling light.