Well, it's been recommended to me because only a few days after having a hopper, he's obviously hungry again. In fact, he had one early this week, and now he's searching for more (see thread coming up in a couple of minutes). I'll have to see what a "small mouse" really looks like, as the hopper is already just about a good match for his girth.

I don't mind visiting the pet shop every five days, though, if that's what it takes.