Word of advice, make absolutely sure they are the same gender, which I would take them to the vet for, do not trust the pet store clerk. I made that mistake, ended up with a grand total of 27 of the little buggers (They breed quickly and tend to inbreed). As for housing them together, I didn't have any problems with housing two of the same gender...it only became an issue when there were many more of them. Lol
For your other questions, a 10 gallon tank is fine, I tended to just buy standard hamster bedding and food rather than anything specific
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