I bought three few months old chicks from local breeder on Monday, one is doing fine, one is sneezing a little, and one wasn't moving much. By Saturday, the one that wasn't moving much is dead. What can I do at this point? I want to believe seller didn't mean to sell me sick birds but how can she just died like that? All three are put in a separate cage (12' x 12') since I got them home and haven't been exposed to my own flock. They have shade, clean water, and food. Have their own hen house (new). What should I do at this point?