Getting started

IMO there's not much difference in size of mice after hopper. You can the larger retired breeders but there is still not much difference. At a year and half I wouldn't go any lower than an adult mouse...
Leave him alone for 5-7 days.
Was he eating f/t for the previous owner?

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Yes,but I don't think the previous owner had a clue as when I got him his head was really dry,his eye looked horrible,all until last night when he shed,but I'm still not having any luck with the feeding..