My hens are dealing with what I thought might be some sort of an eye infection, but now I'm not so sure. I've been treating one hen with Terramycin ointment for the past couple of days. But this morning, when I went out to check on them (5 silkie hens, and 1 silkie rooster), that hen's eyes looked swelled and were shut. Now I'm noticing that the other hens' eyes have that "sleepy" look. They all seem to have kinda crusty eyes. Here's a picture of the one that is the worst:

There's no sneezing, or breathing issues to indicate a URI, but from what I've read, it sounds like it could be a URI. With other hens starting up, I'm really scared. The only antibiotic I have, which I have used in the past for a URI is Tetroxy HCA-280. I've put that in their water (1/2 tsp per Gallon). Please, anyone, I'm not sure what else to do, so any help would be greatly appreciated.
There's no sneezing, or breathing issues to indicate a URI, but from what I've read, it sounds like it could be a URI. With other hens starting up, I'm really scared. The only antibiotic I have, which I have used in the past for a URI is Tetroxy HCA-280. I've put that in their water (1/2 tsp per Gallon). Please, anyone, I'm not sure what else to do, so any help would be greatly appreciated.
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