I have 10 chicks ranging from 1 week to 3 weeks. They are different types and from different farms. All but my 2 cochins (11 days old) are doing great. the 2 cochins are not growing and very lethargic. I have to clean their bottoms daily. I recently separated them from the others because they are so small now in comparison. they have not been picked on, they are warm, they are on the best chick feed. I was told to give them a pinch of Duramycin-10 in their small (1 quart) water bottle for 3 days. Today is day 3 and Im wondering if I am doing the right thing for them.