Decorate your desktop with a virtual school of Neon Tetras. Neon Tetras are extremely popular aquarium fish. Since they stay quite small and have a peaceful temperament, they are often found in small community aquariums. A shoal of brightly decorated Neon Tetras will add color as well as activity to your desktop. Fish Description: The Neon Tetra is a pelagic freshwater fish native to tropical parts of northern South America. Just like the other tetra species, the Neon Tetra has a spindle shaped body and a blunt nose. A glistering blue line runs along each side of the body, from the nose and all the way to the adipose fin. The Neon Tetra is also decorated with a red stripe that runs from the middle of the body to the base of the caudal fin. The side over the blue stripe is of a dark olive green shade.