Okay, to a lot of ya all I know I am going to sound dumb...but I cannot seem to help myself! I purchased 5 chicks Oct 8th ranging from 8 to 12 weeks old. I think my chickens have CRD, but I am unsure. I have done a few things but I feel like I am failing them! The story starts a few days after I brought them home: I noticed my Australorp (the 12 week old) smelt bad October 10th, which this could have been present the whole time but I did not notice it until then. Her eye looked funny on Tuesday, the 11th. The 12th I gave her a bath and made a vet appt for the 14th as that was the only time I could find an available CK vet. He suspected CRD but since her breathing was clear and she otherwise seemed healthy we decided it was likely to be a bacterial infection that may have occurred during transport (2 hour drive). He checked the eye for trauma but that was not apparent. He also discovered after a fecal test that she had coccidiosis. He recommended she be kept separate but it was likely that if she had something infectious the others were already exposed. If the others were to develop eye pus or respiratory issues I should cull. She got better! I used tetracycline in her eye and another oral antibiotic for the coccidiosis. I treated the others with corid just in case. Everything got better. Everything was better until 11.01.16. I noticed my cuckoo maran, who was then a little over 10 wks, was being very lethargic. That night the australorp began breathing heavily. I isolated the two and put them under a heat lamp. I started adding oxytetracycline to their water. By 11.02.16 the barred rock who was about 11 weeks had a watery nose. I added her to the sick pin. On 11.03 I saw one of the remaining two sneeze and then added the remaining chicks to the "sick bay." Nothing changed for several days, the lethargic one stayed lethargic, the sneezy wheezy australorp remained sneezy and wheezy, and the barred rock had an occasional runny nose. The other two had an occasional sneeze but were otherwise fine. I purchased Tylan 200 11.06 and discontinued the oxytetracycline. I administered .25 ML oral doses to the australorp and cuckoo once a day. On 11.09 the cuckoo stopped eating and drinking, her eye also swelled up like the australorps did when I first got her. I started giving the cuckoo the tetracycline topical eye med. On 11.10 I started giving them all boiled eggs. I blended boiled eggs with water and electrolytes and administered oral doses to the australorp and cuckoo who both seemed to stop eating. The australorp began eating normally after, but the cuckoo is not doing so well. The barred rock sounds more raspy but is as spunky as ever. The other two are totally fine. Poop: I have noticed more runny light stinky brown poop (cecal). The only other thing is that the Cuckoo's poop is covered in white but has a light green tint to it. Should I start giving the tylan as an injection? How much should I give, and to whom? Should I be doing something else? When not mixing corid or antibiotic with water they have always had probiotic, ACV, or electorlytes in their water. (electrolytes even when antibiotics have been given). I know people will say cull, but that is not an option to me...so please spare me of those comments.