I am new to the chicken keeping and I traded my rooster for two hens, which are now sick and made two of my other hens sick. They have sneezing, raspy breathing and one of the new hens has a nunny nose. I now know I should have quanantined them but it's too late now. I bought tylan 50 and gave the sick ones 1/2 cc today and put some other meds in their drinking water that the co-op sugguested. Is there anything else I need to do or will this work? Really upset that my girls are sick.