I have read that they are not social, and per my asking the person I received my first one from before getting another she said it would be fine for them to be in the same space. And I am not aware of breeding specifics, but had been told there are several things that have to be done before they will breed to begin with. But we do not wish to breed at this time, nor in near future, so we do plan on getting them space. But for now the 75 gallon tank we have is all we have.