A long-time favorite among aquarium hobbyists, the Rummynose Tetra is native to the Rio Orinoco and the Amazon River in Brazil and Venezuela. These fish are typically found in blackwater rivers and tributaries where the water is stained with tannins from decaying plant matter. Rummynose Tetras are sometimes incorrectly called Firehead Tetras and are named for the deep red coloration on their heads, including the eye. The bodies of this fish are torpedo-shaped and silver in color, though some specimens exhibit a slight greenish tint. The caudal fin of this species is often ornamented with black and white horizontal stripes.