hi mate and welcome!
if it was me, i would be looking to either try and get him onto rats, if not, X2 ex breeder mice, or jumbo mice.
a royal will eat a medium rat if given the chance, so compare that to the weight/size of a mouse, you can see why he may be a little thinner than normall, i would just offer him x2 mice, the biggest you can find, and he will soon bulk up.
after 10 years, he will be a sod to try and transfer to rats, so maybe the eaiser option is to not stress him out, and just double what his been having, maybe do X2 jumbo mice, over 10 ten days, rather than 7.
or try 1 small rat, and rub a mouse over it!, he may just take it.
All the best.
Tom.
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Royals Are Lock And Loaded.....( Not a pun! )...
Because a thing seems difficult for you, do not think it impossible for anyone to accomplish.
- Marcus Aurelius
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