I have some 6 week old jap/serama bantam chicks. We bought them with there mother at 2 days old from a farm across town. We put the hen outside about 2 weeks ago. About 4 days ago, found one that was not quite itself lethargic and ruffled feathers. Next morning it was dead with no wounds. Then everyone seemed fine until yesterday we had another with the same symptoms. The poop seems normal no blood or diarrhea. That chick died as well. We have three more looking ruffled but not totally lethargic and they are drinking . I added some Sulmet to the water. We do not use medicated feed. We have them separated from other chicks but they are still in the same area a 12 x 25 garage and we are worried about the remaining chicks. We do go to sales often maybe we picked up something and brought it home. I would like to know what this sounds like if anyone might know.