my chicks were born on the 16th of October have been doing great until recently. My flock outside is sick with some sort of respiratory illness(sneezing, sniffles) I have them on Duramycin-10?? i think some sort of powder antibiotic. i think they are doing better... today i noticed some of my chicks sneezing a lot could i give them the same thing? does anyone know how to dose it? Ive never had sick chicks before really worried! any advice would be greatly appreciated, thank you!