My hen, Opal, has been experiencing what looks very much like sour crop. I've been researching on what to give her, and I found out that one of the things I can give her that I already have is Duramycin. My only question is, how much? The bag has dosages for other illnesses, like something related to the air sacs (I forget what they called the illness). SHould I just follow this dosage, or should it be more/less powerful? If more information is needed, let me know!