Hi, I have a very small flock (1 seven week old and 3 two weekish olds). One of the younger ones has been sneezing and wheezing since I got her on Saturday. I quarantined her to see if if was respiratory or something else. Today I heard one of the other chicks sneezing, so I went and bought some Duramycin-10 powder as recommended on these boards for respiratory infections. I am planning on treating all four of my birds. I have read the directions on the package and have some questions. The directions say mix 200-400 mg with 1 gallon of water, but my little flock doesn't drink even close to gallon of water in a day...they rarely finish off a quart between the 4 of them (in several different waterers). So should I must mix up a smaller batch? Will they drink enough for it to be effective? Should my younger birds get a more diluted mixture than my older bird? And now for the question that I am afraid is really dumb...how do I measure out mg? I have a little kitchen scale, but it isn't marked for milligrams (is that even what mg stands for in this case?). I am new to chickens, so I will take any advice/tips you have. Thanks!