Neon Tetra (5 letters) and Neon Tetras (6 letters) are both common names for a freshwater fish native to South America. The scientific name for the species is Paracheirodon innesi. It is a popular aquarium fish due to its bright colors, which include a bright blue stripe along its body and a red stripe near its tail. Neon Tetras are small, usually growing to a maximum length of about 2.5 cm. They are omnivorous, feeding on small insects, worms, and plant matter.