I recently purchased 2 golden comets that are around 20-22 weeks of age . They were in a flock with about 50 others . When I got them home I noticed that one of the girls sounded congested. Shakes her head and makes a wheezing sound . I have read several other post about this containing the same thing with other birds . She is in my flock with the one I got her with and 8 others that I had already . Have not noticed any symptoms in any of the other birds. I read on a previous post that a good treatment for her would b duramycin-10 . My question is should I mix this in just her water or in the others water as well . I don't want the others drinking it if its not needed but hate to just separate her since she is new to flock .