The true Kuhli loach (Pangio kuhlii), which can be used as a synonym for the "coolie" loach, sometimes referred to as the eel loach, is a small, eel-like freshwater fish belonging to the loach family (Cobitidae). It is native to the Indonesian island of Sumatra. This snake-like, worm-like creature is very slender and nocturnal. Its distinctive orange-pink coloration with triangular black stripes and its long lifespan make it a popular aquarium species