I would go to the feed stored and buy some Corid.There were four that were puffed up and only one made it. I heard medicated chick feed was created to help with coccidiosis, do you think switching them to medicated feed will help?
Liquid Corid dose is 2tsp or Powdered Corid dose is 1 1/2 tsp per gallon of water. Give for 5-7 days as the only source of drinking water.
Medicated feed that has Amprolium in it has a very small amount of medication and will not treat an outbreak. Just get the medication and treat your birds instead of hoping.