Black Neon Tetra
This species is of typical elongated tetra appearance; it is of plain basic coloration but with two distinct, adjacent longitudinal stripes, white above black. The eye has two thin but distinctive color bands across the top, red above yellow. It grows to a maximum overall length of approximately 4 cm (1.6 in). Despite its common name, it does not particularly resemble the neon tetra, which belongs to a different genus. The fish's natural diet consists of small invertebrates and plants. H. herbertaxelrodi is commonly kept as an aquarium fish by hobbyists.