Give it a week or so. Sometimes it takes awhile for a plant to get going. You may have screwed up by adding nutes. Youngsters can't handle it, but if you just added a little, you might be ok. Once, a long time ago I did that, and about 25% of the seedlings survived.

And keep your lights at least 2 feet back during the first couple days, then gradually move closer. Imagine coming out of a pitch black, deep sleep, and having a 1000 watter 6 inches from your face.