I have 7 girls currently, a group of 3 and a group of 4. I would like to introduce the two groups but I'm thinking that might make too large of a group? The cage calculator says 9 can live in a 40 gallon, so I'm not too worried about space, more just about the structure of the group, I don't want them splitting into two groups and fighting, as I know that can happen in large cages with large groups. I have experience with many introductions so I'm able to tell when fighting is happening vs just a mild argument. I'm worried they might gang up on Blossom though and pick on her because she's elderly and has trouble moving around? She most likely wouldn't be able to fend for herself. Opinions?
I also have a 40 gallon, my 7 girls live happily in there together with no problems. If you're worried about them splitting off, try just putting one larger hide in the cage so they all sleep in the same nest. I don't think you should have any problems, I hear many people say you shouldn't have more than 6 mice together but I've seen many people keep large groups together with no problems
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I’ve had 6 girls live in a 40 breeder, no problems. It of course depends on the mice. You won’t know til you try. Larger groups can work — it’s just most recommend not going with groups larger than 6 until a person has more mouse experience. Which you do.
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