I'm going back through and reading all of the posts, and in the first poo pictures I see very clear signs of coccidia and/or intestinal issues as well as moderate to severe dehydration.
Additionally, this pictures shows all poults looking chilled and/or sick:
View attachment 1119372
If they were mine I would keep them indoors in a brooder that's at least 80 degrees, and watch for signs of over heating. I would stop giving garlic/acv/syrup, etc, and give plain water with Corid.
These are the amounts to use with poultry. Ignore direction on bag or bottle because those are the cattle directions, not poultry directions.
- Powder - 1.5 teaspoons per gallon for 5 days
- Liquid - 2 teaspoons per gallon for 5 days
I would also give them an oral drench:
- Powder - mix 1/2 teaspoon powder with 2 teaspoons water. Stir well and give 0.07 ml per 100 grams orally for 1-3 days.
- Liquid - give 0.02 ml *undiluted* Corid per 100 grams orally for 1-3 days
Do this in addition to their medicated water.