Fish tanks are a lot of fun. The fish make for great pets that take very little to take care of them save for regular tank cleanings. When choosing the kind of fish you want, you have to consider how much time you have. While saltwater fish are pretty spectacular in colors, taking care of a saltwater tank is a lot of work. There are a ton of amazing and cool-looking freshwater fish out there. You just have to look. Here is a list of the coolest ones we could find.