This isn't a massively important but I got a new royal a few months back. When I got him he was on medium mice. I have been getting him onto rat fluffs but unless they are scented with a mouse he isn't interested.
It's not a big problem as I always have mice in for the corns but I was wondering how long will I have to scent for. Will he take the rats eventually?
It's impossible to say as they're all different, but good that he's taking the rats and that you can use the corns' mice for scenting. I reckon he'll grow out of it and end up taking his rats au naturel.