Looks like you burned her buddy. I'm not doing good in coco either, I'm getting there though, imma burn through another couple seeds lol. I got nitrogen tox, I just started some autos that are looking really good though.
A little burned. No big deal. Use the advice above and do the less is more approach. You are very early in veg, so please wait until your pots dry before trying to “fix” the issue in a week they will be good to go.