A goldfish can make a good starter fish, but more realistically they are just as hard to keep as any other type of fish. They get the label of being "Hardy" fish because they can tollerate poor water...
No they do not. Goldfish are coldwater fish (need to be kept around 60F?) and Glowfish are tropical fish (need to be kept around 75F) Goldfish will grow large (10 inches +) Glowfish are really Zebra...