Ok, so in regards to husbandry:

He has a hide. This one is new though because I thought the other one didn't make him very safe. Plus this one is heavy so helps me hold the thermometer probe in place.
Warm side around 90F.
Cool side around 80F.
Humidity around 60% (last week was a bit dry sometimes it was at 45% but I sprayed the tub a bit and it went up.)
Aspen bedding.
This is my thermometer.
Using Hydrofarm thermostat.
Using Zoo Med small UTH.
He's on a 15qt bin.

He spends all his time in the hide, and some nights he goes out and drink water and explore the tub. He does this a lot in the morning, around 6-7 a.m. He pooped something, or it would seem like poop but a very tiny thing, at first I thought it was pee on aspen but it was poop in the end. I'm also worried about my scale, I don't like it at all... I thought it might be good but I don't know now. I'm not a small person, but I do have small hands (small palms, long fingers).

In regards to feeding attempts:

Now, the first thing I offered him was a F/T hopper at night, 6 days after I got him. I dangled him a little bit in front of him and he seemed interested, he smelled it and pulled back. I left the mouse there, he didn't take it. I then offered a rat pup a week and some days later (yesterday), I thaw it and then used hair dryer to warm him up, he still didn't take it. I really don't want to feed him live but if there's no other way I'll do it.