Hey Jason can't really tell from this picture but from your description I would treat for heat stress. Curling up leaves as well as browning on the leaf would indicate for both.
What distance are your lights at?
Do you have fans oscillating in the room?
Also did you use any nutes in the feed because avoid that if using FFOF soil for a few weeks.
I would push lights up more and fans if you do not. Keep the course they are still young they can recover also don't water ALOT during this stage give them small amounts of water more often is what I do during this stage because the roots aren't very developed to handle a lot.
Also next feed maybe add a Mychro to help it recover (Great white does wonder)
Stay positive :)
How often are you watering and how much?