Hemigrammus erythrozonus, also known as the glowlight tetra, is a small tropical fish found in the wild in the Essequibo River, Guyana, South America. It is silver in colour and a bright iridescent orange to red stripe extends from the snout to the base of its tail. The front part of the dorsal fins are the same color as the stripe. Other fins are silver to transparent. The Glowlight tetra is a peaceful, shoaling fish. It is slightly larger than theneon tetra, and its peaceful disposition makes it an ideal, and popular, community tank fish. It should be kept with similar sized, non-aggressive species.
H. erythrozonus is a medium size tetra growing to 4 to 5 cm (1.6 to 2 inches), notably larger than both neon tetras and cardinal tetras.