Now that we've moved into our new apartment and plan to be here for a while I've been thinking of getting a fish tank. I previously had a 3 gallon tank. I'm thinking of getting at least at 10 gallon tank. My fiance said I should get a 20 gallon tank, but I'm not sure. Also, we were discussing what kind of fish to get. I want something pretty, but something that also lasts. He suggested guppies. Also, how many to put in a tank. A pet store clerk once told me 1 fish per gallon. I figured that I'd get 5 for a ten gallon, but my fiance seems to think that's too many. Any suggestions?