first thing i would do is get them outta that soil. they should start in seed starter or soil with no fert until they get a little bigger.
You need to pull them out, get as much of that soil off as you can with damage to the roots and replant them in soil that wont burn them down.
although as small as they are...... did you pay a lot for the seeds? if not id start over. otherwise youre gonna have baby the crap outta them to get them back.
I had something similar with some i started not too long ago. i had to replant them too didnt think they were gonna make it but they are so far.