My boyfriend and I recently acquired a five year old male tangerine bearded dragon. He's always been lazy, only running around the cage when we throw crickets in with him and otherwise staying under his lights.
He's in a 40 gallon critter cage with astroturf bedding, a hide log, a piece of driftwood we recently bought, and a water bowl we keep clean.
Today I walked by the cage (we check them several times a day) and he's BRIGHT orange. Paired with this, his beard is solid black and he's got two black spots right behind his head and over his arms. We've picked him up, turned him over, and been handling him for a good twenty minutes while I searched the web for beardy illnesses. I haven't found anything that says more than "beardies suffer from low calcium levels and impactions." However, during all this handling, he's flailed a little bit, but every time we put him down, he just... sinks, doesn't move, and his eyes won't open. There's nothing in his eyes or his nostrils, though he's got crusted poop on his anal opening. Also, I can't even see or hear him breathing.
This is very sudden as two days ago he was doing fine, normal coloration, attitude, and everything. Please help!
(Also, his tank is beside a corn snake's, would this cause him to stress out so bad it would make him sick?)

Normal

Current

Throat


I don't bathe my beardies in 100 degree water as a rule either.