Our Speckled Sussex rooster was injured on his comb and face during a fight with another rooster. His left eye is swollen shut. I've been putting triple antibiotic ointment on his eyelid for a couple of days now. I separated him from all others as soon as I found him injured. I noticed today that where he slept last night there is green poop. Does this mean an infection and if so what antibiotic can I put in his water? I have Oxytetracycline HCI powder on hand.