A chick starter should be good.. but if they were accidentally eating the bedding it could block them up digestive wise. I usually keep mine on paper towels for a few days until they know real good what the feed is... so that might be one possible issue. Also, double check for pasty butt often. It happens even in chicks that weren't shipped. Seems like these things MIGHT start to show some lethargy first.
As they get about 3 days old they will digesting feed instead of the yolk that absorbed at hatch to sustain them while their mama gets ready to take them out looking for food and they get their land legs. It is often at this mark when you might see some failure to thrive, usually though the chicks will be mad from starting to get hungry and not really connecting with food. But if they are eating the bedding they might be getting full, and it passing... but not getting enough nutrients, which I think is kind of the symptoms described.
Did these all hatch on the correct day? Just curious about incubation or hatch factors.
I recently had a stargazer hatch from a friends egg... I dosed with the nutri drench (I usually cull from my own stock because I don't want genetic weakness breeding forward).. and it worked THAT time.
Hard to say if they will make it through the night or not... all you can do is YOUR best, and it sounds like you are.
Oh ya, the paper towels early on also help me to see that everyone is making their first poos after hatching. It's such a learning process, congrats on your babes! I would go ahead and grab some chick grit OR bring in a small dish of dirt from outside so they can get some grit to help digest that bedding if needed. (I see you're gonna remove it for a bit, maybe a good idea.)
And... kids are great! Hang in there.
