I have 5 chicks that are 2 weeks old now. I acquired 4 of them when they were 2 days old and then got the fifth at 6 days old. He is a runt and has mangled feet and so I have kept him seperate. All chicks are rescues from a back yard breeder that was not taking proper care of them and so I dont know their breed. The first set of chicks started open mouth breathing and sneezing last Saturday and so I called my vet who said to start them on Tetracycline. They only had Oxytetracycline at the COOP which I started this past Monday evening. I have never had chickens before and I have to be honest and say I feel I have royally messed this up. After a couple of days on the meds I was looking for information to see if I could mix their electrolytes with the antibiotic and discovered I was supposed to have been making a new batch every 24 hours and I had been doing it about every other day. My little runt doesnt seem to be getting better and sounds rattling so I was looking for other ways to help him when I found a post that said Oxytetracycline should be 1 - 2.5 tbl a gallon and I had been doing 1.5 tsp. I had gotten the smaller dose from a forum but I mustve read it wrong. Im wondering if I can start them on the higher dose or if now theyve built an immunity and it wont work. My bigger group is doing TONS better but still a little sneezy from time to time. I am very worried about my little runt and am hating how much I have messed this up. Any help would be greatly appreciated!