You might be over-watering your seedlings too.

Let me give you a fun grow tip! If you know that you have been watering too heavily for the size of the plant, the drainage, the soil type, etc. one of the things that you can do is try to force the plant to use water faster. You can do this by adding some more light (in your case a couple more CFLs), and increasing how fast air is being exhausted from the room. You want those plants to start sucking up the water in their pots, and extra light really helps that, not to mention making them grow better.