I have 2 chicks with runny noses and another one that is puffed up and seems content to stand with her eyes closed. But, all seem to be eating and drinking normally. I really don't want them to get sicker and I don't want any more of my 15 chicks in my brooder to get sick either. The chicks range from 3 to 4 weeks old. What should I treat with? I can head to the feed store in the morning to pick up whatever I need. Thanks in advance for your help!