Here's my set-up: 19L tub, 2 males, 3 females, igloo hide, wheel, water filter on side of tub, and giant food bowl. I've had 1 female and 1 male since I started it out, added another male, and just recently added 2 more females.

Is it in all common to see 2 males get along with one another? I heard that males or brothers of litters should be separated because they'll fight, but so far the only aggressor out of all of them is the 1st female I got (who is I think pregnant). Otherwise the males get along perfectly with each other!

Is this good for breeding mice to have 2 males in the same tub with all these females?