I have arooster that has not been acting himself latley. He has become lethargic and unsociable. His eye had what looked like foam in it yesterday and today it is sealed shut with a yellow crust. This morning he had some greenish yellow gunk coming out of his nose. Now he is just holding his beak open and does not want to "wake up" When i first noticed this i seperated him from my flock... so now he is in quarintene... any ideas out there??