I have a dozen chicks and one of them seems to have a bad respiratory infection (acting sick, eyes swollen shut). I isolated her and cleaned the enclosure, but I'm guessing they've all been exposed. Is it still possible to obtain poultry antibiotics over the counter in the USA? I remember something about fish antibiotics being taken off shelves because people were taking them, and I can't find them in any stores. Is there anything I can do for my short of taking them to the vet? I'm not terribly keen on a big vet bill for chicks that might not make it regardless.