Hi so, 3 of my 4 week old chicks came down with congested breathing a week ago or less, one of my young pullets started drooping her wings a little, about the same time (its been unusually hot so I didn't worry too much about her) and now she is also sick I heard her breathing from inside the coop from inside the house through the open window. I brought her inside the house and moved the chicks to a different room in the house. My concern is I had a bag of manna pro chick starter (medicated) that was infested with grain mites this was about 3 weeks ago that the feed exploded with millions of mites I read that they can spread bacteria and fungus? I had called the feed store where I purchased the bag they would not take responsibility and said that I needed to have the bugs inspected by Colorado University master Gardner he confirmed that the bugs came from the feed and told me to cook the food at 125 degrees for 20mins in batches and bleach the storage containers/feeders and dust coop and house with DE which I did but now my young flock is sick! and the only thing I can think of is those nasty mites may have exposed them to something? I started the chicks on oxytetracycline and they seem to be improving in a matter of days they started doing better, I was doing 1/4tsp in the quart waterer should I double this for the older ones My newest ill girl seems worse then the younger chicks. I was out with them earlier this evening and she seemed fine running and eating and drinking normal, but this very sudden change, has got me really worried about her breathing. Even the dogs seem disturbed by her breathing! she sounds like she is crying/whaling. can't take her to the vet! they want $67 just to walk in the door and I am not working right now All others seem fine I picked each sleep chicken up and listened to their breathing. But I want to start them on the antibiotics asap just to be safe! any help and advice please please share. Also the package says not to feed dairy while on the medication any suggestions for probiotics?? I have had them on AVC water all summer, but I don't want to mix the 2 together and need the antibiotic to be the sole water source.