Is this a bad idea?

yes they will fight over the girl. you can have 2 boys or 2 girls or 1 boy and 1 girl. not sure how many boys and girls you can have together if its a big colony but i know that having 1 girl and 2 boys is a bad idea.

If introduced, yes, very bad. Better to start with m/f and grow a colony.

yep if you have 1 female they will definatly fight get another female so ther are enough girls to go around lol

depends... Of course it helps a lot if the males are all neutered. Here are a few success stories:

Gary, Hexx, Jinx and were just adopted out and they have been together for a year without incident M/M/F. Gary was introduced to Hexx and Jinx who were terribly frightened and crabby as young adults. We introduced Gary to them (one year older than the other two) and they all fell in love with each other. Within days, Jinx and Hexx calmed down by about 50% and today they are downright sociable.

Oscar, Ponchito and Rockie are M/M/F and they are all OK. Oscar and Ponchito were introduced first and Rockie joined them later. Oscar is 9 years old and the other two are only a few years old.

That said, even after neutering, a bunch of males and one female CAN be a big problem - even if they are from the same colony. Take, for example, Bonnie - the matriarch of the Tank colony (five males - all neutered). She had to be culled out of the Tank colony because of two separate (post-neutering) mating wound incidents.

Our experience has been that the damage to females is more likely in larger, mixed colonies, not 2:1 MM/F trios. It seems the larger the colony, the dynamics are different. Not only are there more mating wounds (or mock mating wounds) but the larger the colony, the likelihood that one or two get "punked" and picked on is higher. For example, the Dwarf/Princess colony was at 15. After the 7 males were neutered, we discovered three females with mating wounds. But guess what... after separating the females from the males - there was one violent death amongst the now all-female Princess colony and then two separate back wounds. That prompted us, after conferring with our vet, to break the females down into pairs to change the pecking order dynamic. Ever since doing that the girls have been fine. The boys have all been getting along...

Another large colony is the Indy's (9 after the birth of Jones). Recently we had to take Ginger, one of the younger girls out of that colony after she got a big back wound. She's not going back. The colony is just too big and we are afraid she will just get another wound. We usually go by the rule "two strikes and you're out" but in the case of larger colonies, it's one strike.