Kabhyper~ I don't know anything, but I did wonder about all that dust flying around the chicks during dust bathing. You mentioned you had DE in the dust, I think, and sand-- was it Play sand or more coarse sand? In my "Chicken Health for Dummies" book, Causes of "Wry Neck" include poor hen nutrition (not likely) and a genetic trait. Another possibility causing respiratory issues is "Brooder Pneumonia" (Aspergillosis). To find out more, Google: Brooder Pneumonia Aspergillosis Good Luck! As far as antibiotics in general, the book says to make sure the med is labeled for chicken respiratory illness and that "products with erythromycin, tetracycline, or tylosin are good first-line antibiotic choices that are available at many feed stores."