Just started a tray of tomato and bell pepper seedlings a little under a week ago. Used rapid rooter, had a cover over them. Took the cover off last night as I started seeing the first signs of the first set of true leaves coming up. Had a T5 flourescent over them since they started sprouting for 16 hours/day (picture of setup here http://i.imgur.com/BSibsh.jpg). Haven't needed to rewater as all of the rapid rooter cubes have stayed moist throughout (and still are as of this morning). At this point the cotyledons leaves are starting to curl and look dry like so http://i.imgur.com/mWWeV.jpg. Light is about 6 inches away, starter cubes are moist. Is this normal or am I doing something wrong?

Here is a link that might be useful: {{gwi:250048}}