Good job yes just leave him alone especially if he's new and still setting in. Now you just need to set a feed schedule that you feel is right for him and yourself. Based on what i read just try feeding him again in like 5-7 days he's a boy so no need to stuff him. He'll probably be taking rats eventually so i won't nag you on trying to switch him to rats. For now if he likes mice he likes mice at least he's eating. I'm not gonna get big on your care but i will say i hope you got a thermostat for starters.