I have a freshwater fish tank, and it is hard to find unique looking freshwater fish. So, here is a list of the most exotic freshwater fish you can find.
Yeah...they actually have a whole bunch of freshwater puffer fish. A lot of Walmarts sell the spotted puffers, but they don't get along with other fish very well.
I have had one for 3 years. He has never bothered fish that are larger than feeders. If you are opposed to live feeders they do well with freeze dried shrimp. Never seen any aggression towards tank mates. Stays at the tanks top and are a very nice addition to a tank. (they can grow large and a do well in larger sized tanks of minimum 55 gal)