I have had common goldfish before so I know how to take care of them but I was just wondering can all goldfish live in a goldfish bowl? I ask this because when you go to a pet store you always see the really interesting ones in an aquarium, i've always wanted a fat goldfish, im not sure what they are called, but they are quite plump and have fairly large tails,also how can you tell a male fish from a female? Thanks =)