Is that feed medicated with the Amprol/amprolium?also a portion of the food I gave him was medicated chick feed
Giving that to him might be enough without adding the corid type dose (I mean for the near future days too). Though it's still possible to have to treat for cocci even for people who do use medicated. It might be a good option since it's difficult to get into town and such. A broody will not usually allow another chick to come eat with her and babes. And definitely WON'T call him to it. They can be hags protecting their babies resources. Of course all are individuals, and I know I can see anything new or unusual at any time.

It's good to be able to look back at previous things and go... Ahh, now I get it...

I am glad you are seeing some improvement. Doing the little things that add up to him being less stressed can be a good enough boost for him to continue fighting it off as he has been prior to now. Sometimes supporting our birds OWN immunity is ALL the help they need! Other times that simply won't do. But definitely helping boost their fighting chance until we can get to the remedy is great.
I keep meeting peeps from all over the world!

