Yesterday morning I bought 7 silkie and 1 polish chick. I was told they are 3-4 days old. A few a lot smaller than the rest, so I am assuming they are more like 1 day old. When I brought them home, I noticed the bedding in the box they were packed in smelled sour. I put them in the brooder with fresh bedding. By afternoon I noticed one with runny butt, lethargic, standing alone. By evening he had passed. In the morning I noticed another chick looking lethargic and standing alone. I researched the first chick's symptoms and the heavy rain we got last week, I think they have coccidiosis. I already have them on medicated chick starter (all my young birds are on this). I added electrolytes and probiotics to their water (I was out yesterday). My afternoon I lost the other chick and the three smaller chicks started to look weak. I made a mixture of feed and water and used an eye dropper to feed them. Tonight two of them seem to have turned around. They are not as active as the rest but they are eating and drinking on their own. One of them is holding on, but I don't think he will make it through the night. Assuming I keep the bedding clean, them on medicated feed, how long does it take for this to run its course? If everyone looks healthy in the morning, are we through this? Can I quit stressing then or is this something that I have to worry about suddenly striking the rest or reoccurring in a few days or a week? It's hard to protect your heart from the sadness of losing a chick when you have to tend them so vigilant. Side note, the polish seems to be thriving.