Sometimes they won't eat for a day or two if they're not hungry, which can be okay.

Is he bloated at all? Does he have a bump in his right belly? If so, he needs to poop. Give him a nice lukewarm soak in his water bowl. Just set him in and let him be . Buy some plain honey and keep it available in case you need it.

If he looks normal, just offer the food daily. If he refuses, it's okay so long as he's eating every couple of days.

How big is he?

If his house temp is about 80-82'F during the day and 78-80'F at night and his humidity is at 80%, then his settings are just right. The daytime temps will help him to properly digest his food.