This batch of arabidopsis seeds seems to be faring much better. I added an incandescent bulb to my lighting on Monday and the plants appear to be taking much better than with the fluorescent alone. I need to get another timer to put that light on so the plants can have a full 16 hours of both lights.
I also added some micropore tape (used for wounds and stuff) to seal my samples. This allows the plants to breathe and hopefully minimize evaporation. The corks that I was using before seem to do a good job, but I was always fearful that I was hindering air transfer. This method gives me a little better peace of mind.
Here are some seedling images for your viewing pleasure: