I don't want to be the messenger of doom & gloom but I've known too many people who've lost their sliders because they kept them with snappers & the snappers killed the other turtles. I'd put that snapping turtle in a different container.
Along with what others have already said get a good submersible heater & keep the water temp warm, 75-80 at the highest.
If they don't start eating soon, if you can find some feces in the tank, run that in to a vet's office & have it tested for parasites. Most vets will run a test for you without seeing the animal. They'll want to see the pet IF they find parasites.
Good luck with the babies.
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PHRatz

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