The rainbow shiner, scientifically known as Notropis chrosomus, is a small, colorful freshwater fish native to streams and rivers in the southeastern United States. Renowned for its iridescent scales that shimmer in hues of blue, pink, and purple, it is a popular choice among aquarium enthusiasts. Typically growing to about 2.5 inches in length, this peaceful fish thrives in well-oxygenated, fast-flowing waters. The rainbow shiner is known for its active schooling behavior and its diet consists mainly of small insects, crustaceans, and plant matter.