When you get some stronger light on them, they'll stop stretching so much. A good rule of thumb is to lower the lights as close as you can without letting them get too hot. You can do this by putting your hand underneath the light at the point where the top of the seedling would be. If the heat becomes uncomfortable for your hand, then it's going to be uncomfortable for the plant. But with fluorescents, you can generally get the bulbs very close without burning the tops.

And you can also add some more soil to those pots, all the way up to the cotyledons (round leafs). That'll help keep the seedling from toppling over from its own weight once it grows a bit larger. On top of that, keeping a slight breeze trained on the plant in the beginning will help to strengthen the stem.

Hope that helps! Best of luck with your grow. :thumbsup: