Like hindu says, water less often. You want to let the soil pretty much dry out before rewatering. These look cool, my first grow was under a florescent and I vegged for a long time like you and the plants grew oh so slowly, things will get faster dont worry!
Several things that will help you by leaps and bounds:
get a fan and move some air, even just a little fan, inside your grow room
get a ph meter, you can buy liquid tests for real cheap but I would get a ph pen if you can, you want your ph 6.5-7. if your water is the incorrect ph it can cause the plant to not eat its food and grow slow.
look into a real light/ do some reading about spectrum and lumens, if you dont want an hps light you can add something for cheap that will improve your setup a lot
The only other thing I can think of is temperature and humidity. I have a electric deal that records 24 hour highs and lows of both, if your room gets below 65 or above 85 plants can stop growing for a week plus.
good luck, im always stoked to see someone getting into the hobby