I always ran gerbils at a 1.1 ratio.
Gerbils aren't like rats and mice. They will fight and chew each other to shreds sometimes when you introduce them. So, when I found a pair that worked I let them be LOL. No sense in adding another woman in there. Its hard enough to pair one male and one female sometimes.
Maybe if you introduce them very young you could run more of a colony type situation.
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