getting a mandarin to eat

[MitchM]

Whenever I buy a fish, I only want fish that have been at the lfs for 2 weeks or longer and are already eating frozen food.
I would keep him in qt if he was a new arrival to the lfs.
I would put him into the dt if he was stable long term and eating frozen at the lfs.
You said you're treating with prazipro, but is there a reason why?
If there was no sign of illness, I would not have started treatment of anything.
If there's food in the qt tank, just leave him there.