Thanks for advise!
He is E. Johnii, but requirements are similar to Conicus. He is 153g now, plus 30g compared to last month. I'm going to make sure to record its weight and keep him warm.

I doubt he eats live food tho. He is super duper cowardice, even scared to dead mice... He never grab and constrict like other sand boas do, every time I left thawed fuzzies for him, he usually lick it around for a while to double check it is dead, then starts sloooowly swallow it. When he notice me watching him eating, he will freez, which is kinda funny to see...
But anyway, I loves him and hope he will start eating again