What if they were to breed when the female was extremely undersized and underweight? You would be okay with that and the possible health risks involved? An example, just because 12 year old kids can have babies doesn't mean that they should.
Besides that, I don't think it's a good idea to house two of them together for purposes other than breeding. What if one day you find a sickly stool, how do you know which one it was from?
If you have too many tanks I would suggest a rack or another form of caging. I wouldn't keep them together for the heck of it.
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