Welcome To BYC
Do you have a thread about your chicks? Photos?
Can you tell us more?
You have found a thread that is from 2021, so unlikely the OP will respond to you.
Welcome To BYC
I would treat for Coccidiosis.
You can find Corid in the cattle section of TSC.
Liquid Corid dosage is 2tsp per gallon of water and Powdered Corid dosage is 1 1/2 tsp per gallon of water. Give for 5-7 days as the only source of drinking water. Don't add anything else to the...