Yes they are on medicated feedI didn't know that was a problem-what does it hurt?
A couple days ago when you were asking for assistance, you said they were not on medicated feed:
https://www.backyardchickens.com/t/782569/im-new-to-chicks-and-something-is-wrong#post_11221887
That was the reason Corid was suggested, and due to the symptoms you described.