Coccidiosis can slow a chick’s growth rate. I have never read that about Corid use, and wonder how anyone would know. So glad the chicks are doing well.
So glad to hear they are all acting better. Glad the Corid has helped in time. It is unfortunate that you lost the 2, but I hope the others all survive. Let us know how they get along.
It is hard to get antibiotics without a vet most of the time. Amoxicillin is one that is used to treat enteritis. I would try to get a diagnosis though. Let us know how how they get along.
If you should have another loss, I would send the body in to your state vet for a necropsy. Sometimes a chick will get enteritis after coccidiosis, and an antibiotic may be needed. If a necropsy is not possible, sometimes a home necropsy may show signs of coccidiosis. Here is a link with...
Make sure to give the extra drench boost of the undiluted Corid 0.1 ml per pound of weight. Sorry that you lost another. You might want to get Toltrazuril (Endocox) or the Sulfa antibiotic in case this strain is resistant to Corid/amprollium. Your vet might be helpful to get one right away. Here...
You can put puppy pads or long strands of paper towel under their feet and change or add to as needed in the dog crate. I have old raggedy towels that can be used for such things. Keep us posted on how they are doing.
If you have the liquid Corid, besides putting it into their water, you can also give them a daily boost of undiluted Corid 0.1 ml per pound of weight. Then also make sure they are drinking the treated water, and it can go into a small amount of their feed as well. Make sure their bedding is dry...
I would agree that they have coccidiosis. Corid is easy enough to use for treatment. If you don’t see improvement in a couple of days, Toltrazuril or sulfa antibiotics such as Albon or sulfadimethoxine may be a good thing to use. Those can be obtained on pigeon supply stores online or from a vet.