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Tarantulas are not communal there are one or two species that will tolerate each other but you still run the risk of having one fat spider in the end.Since you are new to the hobby I would suggest that you wait untill you get a bit more experience before you go down this route...
Both, even an adult female will kill its mate after breeding. I considered keeping 3 H. incei together but was eventually put off by reports I'd read that they aren't kept together for more than around a year.