Hello,
All your diary stats look good. So the only 2 things i could possibly think of would be irritation from being in a big container(wet/dry cycle), and then the 24 hours of light under an led this young could be giving it some light stress(or even a bit of heat stress being in the 80s). I know lots of people have good results with the 24/0 schedule, but personally I think plants this young benefit from some hours of dark for a little rest, maybe an 20/4 until they have a couple leaf sets and then go back to the 24 if you like that schedule.
Good luck with the problem solving. βοΈ