hi, everyone, i need your help on trying to figure out why my chicks are dying. i bought some chicks from different places, and as of today more than half have died these are the symptoms: loss of appetite, also they dont drink as much water as before, they shut their eyes and drop their wings, at times they open their beaks, like trying to emit sound, i would say gasping, but no sound at all comes from out of them, they have dark brown runny poop, but i havent notice any blood in it. this is killing my chicks one at a time!!! im giving them the purina medicated crumbles. i wont cull them. (i just learned the term "culling" on this site, thanks. one of the many things i have learned here!!) anyway as i was saying, i dont have the heart to kill them, i want to make them feel better, but i also dont want all my chicks dead. and this is spreading fast almost one dead chick every day for the last 2 weeks! i injected some of them with tylen 50, some died, some survived, dont know if it was due to the tylen. i read about la-200, can i use it? please help! any advice will be appreciated!! thanks in advance.