My friends sister has a goldfish that she doesn't want anymore. It is currently living in a 1 gallon bowl with a glo fish. I desperately want to save this fish (the goldfish) and give it the best life possible, however I do not think I have the necessary money. I am pretty sure he is a butterfly tail, and I read that they need 20 gallons of space. I can not afford this, so i was thinking a 5 or 10 with frequent water changes? My dad doesn't want me to buy from Craigslist because he believes they will not be the best quality, which I disagree with. What is the best way I can give these fish a good life? Where can I find everything cheaply? Should I just not bother? Even if I got them a 5 gallon they would be happier than they are now... but even then I would need to upgrade.