i tried feeding him a f/t mouse slightly smaller than he usually eats.
i thawed it for a few hours at room temperature and then thawed in it warm water.
i then used a hair dryer to heat it up a bit more. the mouse was at around 100 degrees.

i used various approaches. moving it slowly, dangling it, etc. he wasn't too interested. i left it in his tub overnight - he moved it from one side of the tub to another but did not eat it.
any recommendations?