my polish are all dying first they get lame and their wings are down with their head the next day they die and they get this yellow ooze coming out of their vent. they are 1 month old and were very healthy until i brought this mottled houdan chick home and it dyed a day after bringing it home with the same problem . i know i should not have put them together and now im losing almost seventy dollars in chicks. advice much appreciated.