I have a problem with the growth of my aproximately two and a half week old seedlings. They are growing, but slowly it seems. There are nine seedlings, each in their own large bucket with nutrient-rich soil. They sit in a 3 foot long, 3 foot high, and 2 foot deep box painted white (for reflection), with two 18 watt flourescent lights on the top. The seedlings are about 4 inches from the lights. I have given it about 24 hours of light for the last two weeks, and have been watering usually everyday (with small amounts). There is a small mixture of yeast/sugar water mix for CO2 production. The temperature in the box is usually around 65-70 degrees, and the humidity is good. There is virtually no ventilation system, aside from me opening the box daily, and airing it out for 10 minutes, and blowing on the plants to strengthen them. The largest seedlings are about 4 inches high, and almost none of them have a second set of leaves (just the first set). I've seen a lot of pictures of other people's plants after two weeks, and they are always much bigger and more developed than mine. At this growth rate, it seems they will take months before they're mature enough to flower. I'm just wondering if anyone thinks I'm doing anything wrong? Why aren't they growing faster? Is it a CO2, lighting, or ventilation problem? Thanks for any help.