Corid Powder dosage is 1 1/2 teaspoons Corid powder per 1 gallon of drinking water. Make sure this is the only source of drinking water for 5-7days.
I would treat all your chicks.
I would treat all your chicks.
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The poop you posted looked bloody to, she needs the Corid.
Chicks that have a coccidiosis overload will pant and can have respiratory distress. I would watch to see if she develops any other respiratory symptoms.
If it's really hot outside, if possible change the Corid water a couple of times a day, this will encourage them to drink if the water is cool.