I have a 10 gallon fish tank. The all glass rectangle shaped ones. Can I use it for my hamsters? I really want some(two) and have saved up to pay for it and a cage but if I can just use my old tank I could save that money. I want to get two so the one doesn't get lonely,can I get two in that tank and they be happy and healthy? What kind of hamster can I get to own two in one tank? Can I get 2 females or 2 males or do I have to get one male and one female?