oh and also, how big should the 2nd tank be since it will only have the one mouse in it? (2 at the most if we decide to keep one to raise to maturity) Should it be small since there is only 1 or 2 mice, or should it be a grow out tank size? If the latter, how big do those need to be? Same as the current one, or can it be smaller and be an ok environment.

Sorry for all the questions, I just want to make sure that if we do this, we do it right. I know they're food, but the way I see it they're pets too and they need to be as well taken care of and comfortable as any other animal in my home. I don't want to just be shoving a bunch of mice in a tank together and act like its ok to have no room just because they're food. The one I have I think is a 10 gallon. It seems like a decent size. I just don't know if i have room for more than a 5 gallon for the 2nd one. I'll have to see. Lots of decisions to make. If this doesn't work out, we'll probably just get a gerbil. I'm ok with either decision, but I think my boyfriend wants the mice more.