I actually heard that rats are more nutritious?? Not sure but I would just move up to rat fuzzies to insure he eats if you switch on him he might refuse to eat cuz it takes time to switch and you want him to eat
about the scales if he’s eating, gaining weight, pooping and acting normal assuming your husbandry is all on point then you should be fine just feed him right and it the shed should get rid of it if it keeps coming back even after shed then take him to a vet and get it looked at no harm in that
Good luck
Sent from my iPhone using Tapatalk