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Here is the timeline of what has happened to my poor little guy.
A few weeks ago he was treated with SCATT more as a preventative measure and not because i thought anyone was infected (I didn't write down when)

On Friday he was looking lethargic and fluffed. I put him in a separate cage with some heat, guardian angel, and millet.
He was really perky and had tight feathers the next day...so i thought i was imagining things. He went back in with the other finches.
Yesterday morning he looked really terrible. He was sleeping with his head tucked while the other birds darted around in their morning routine. I caught him easily and put him back in the hospital cage. He felt really light and his keel was pronounced

He ate some millet. HIs poop looked well-formed and regular though.
Last night he seemed to be breathing heavily (but not open beak panting). I treated him with SCATT just in case.
Today, he still hasn't moved much. He is hiding on the perch by the food dish. His vent is now wet and dirty. (I think this is because he has been mostly drinking the guardian angel drink and not eating).
I cleaned off his vent and gave him some liquid antibiotic solution on the edge of his beak w/ a syringe. He drank it up.
I was going to see if he would eat a hand-feeding solution (since he's so thin) and i noticed flecks of black crud on his beak. (dead air sac mites?)
***Is this a good sign? Is it him getting rid of the dead mites?***
***Do you think there may be other viral or bacteria issues, or do you think it's because of the mites that he is doing so poorly (thin, wet vent, lethargic)***