We have decided to build a mouse rack to free up some space (all these tanks are taking up too much space) and we were looking at the DIY mouse rack that is stickied.

It calls for Small Van Ness Litter Pans (14" X 10" X 3½") and I was wondering how many mice can live in one of those litter pans. Should the 'tubs' be bigger or is the small litter pan a good size to use for breeding mice. We are trying to keep our groups at least 1.2