I'm new to this and I have 2 Cayuga ducklings, I don't know how old they are but look a 2-3 weeks old. One got a blister bubble one its beak, I treated it with oxytetracycline in water. Stopped giving that to them a couple days ago. The sick one just lays down, I do my normal routine with both . They both play in water when I put them in water, the temperature is fine. I'm worried I'm going to loose it. I really don't know what else to do.
Both of them laying down today
Both of them laying down today