Damping off? Or just damaged?

I used the domes to protect them from heavy wind. I cut holes in it for airflow... One plant is still ok 2nd plant (first two pictures) has maybe the potential to recover. 3rd plant (smallest, last two pictures) looks like will be dead soon although the leaves still look healthy. I see fungus gnats so could be that they brought the pathogens with hem. But also one last thing, I used a fan and it was blowing towards them. Maybe the second one is just damaged? I don't know...

Oof that sucks brother. They could probably be reburied and make it after some recovery but no real way to repot them without bringing spores with you. As per prev comment domes are almost always unnecessary unless you are in the desert, and even then you would always, always remove them the moment the seed pops, any vegetation that comes up in there is just a mould target. Good to catch it early and just restart. All the best with the grow!

I saw in your diary that you used bottles keeping umidity high, and that probably caused the damping off. Not much you can do now, unfortunatelly...clean everything up, start over and don't use any domes (unless you live in a desert with 15% RH).