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I'm not sure where they get their chicks from, but if the marans had a different shipping time, that might mess with them as well. It is odd that it's one breed only. I don't know if marans are more prone to a particular illness. Maybe someone else will chime in. Good luck with them.

Sounds like your setup is working fine. I just wanted to make sure, to narrow things down. You can also try Nutri Drench, either dropper fed, or in their water. You can get it at tractor supply if you have one close by. It's helped my lethargic chicks before.

You can try hand feeding them to see if they are eating at all. If not, try making a wet mash out of their feed to see if they'll eat that. What are you feeding them? Do they have heat on one side, cooler area on the other? Take a picture of your brooder setup, if you can?

Are they eating and drinking? Any other symptoms besides lethargy? How's their poop looking?