At least it will take up a bit of time to eat the crickets out of their bowl first lol. Let us know how it goes! You may need to change up feeding times too. If the one that isn't eating is just too sleepy to care while the other one is game for food at any time, you might want to feed later at night. I agree with holding off on the waxworms. That's more like a donut, high in fat, low in nutrition. Not a good staple to get them stuck on. You could also try dubia roaches though if he has trouble chasing down faster foods.