He had been very healthy, normal droppings, eating well, he would sing all day long. The other night when I came home from work I noticed he was asleep with his head under his wing. I immediately knew something wasn't right because he always greeted me with a 'twirt' when I came in the room. He woke up and began ravenously eating, but was puffy and wings drooping the whole time. It was a very frantic thing, the way he was eating. He kept eating way past his normal bed time and finally settled to sleep in a spot different from where he normally sleeps. He had passed away by morning

When I looked him over in the morning I could easily feel his keel bone, he seemed very skinny. I had treated him once for air sac mites since I got him in Nov. But he has received no other meds. I had clipped his nails back about a month ago and don't remember him feeling skinny. Does this sound like anything in particular?
I am worried about his hen. Should I treat her for something to be safe? She seems fine, she is just finishing up a particularly heavy molt, she is about 6 months old.
I have Baytril, S76 and Ronex.