so my hen with the frothy eyes has now developed what looks like some fluid accumulation/swelling/puffiness under her left eye.. The only antibiotics I have on hand are a bag of tetracycline, sulmet and poultry rx. I am not sure what exactly I am treating so I want to make sure I don't give her unnecessary antibiotics.. plus she is the only one in my flock that has this and is around everyone else sharing food/water etc and noone is coming down with anything like this.. she does eat and drink and acts only mildly less active than normal.. do not see any other nasal drainage or diarhhea from her. what is best course of treatment.. and with what I have I will separate her and only provide her a small bowl of drinking water.. how on earth do you measure acurrately for super small bowls of water antibiotics for only one hen?!?!?!?!?!?