If I were you I would use the vaness litter pans. When I was using the concrete tubs I had problems with the food because its not easy for those pregnant females to climb upside down. Also mice seem to do better in groups of 1.3 or 1.4 I was keeping 1.8 and all the pinkys would get stuck on the bottom while the fuzzys and hoppers would be on top, which killed alot of pinks because they were neglected.![]()