I had 2 pass in one week. The first one was tiny when we got her and she wasn't growing. She slept a lot and was really lethargic. Then her poop got foamy, she stopped eating and drinking then she couldn't stand. shortly after that she passed away. We were told by our breeder friend to give the save a chick and we did but it was to late for her (we even used a syringe to get her to drink). Breeder friend thought it might be coxy as there were several signs and we didn't feed medicated food. So we treated the whole flock who were starting to show the same signs. Everyone started doing better but then the roo took a turn and went down hill this time we were prepared (we thought) and made sure he ate and drank every 30 minutes, checked his poo and basically babied him. day 3 of treatment he stopped eating and was only sleeping and early morning on day 4 he passed away.
All the other chicks are doing well and thriving. We treated them for coxy and gave them very diluted nutri drench for one day after and we haven't had any problems since.