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Hemigrammus erythrozonus

Hemigrammus erythrozonus
Glowlight Tetra
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 the neon 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. It has a life span of 3 to 5 years when kept in good conditions.
Glo light, glo-light tetra, and glolight are alternative common names. Hemigrammus gracilis is an older scientific name. The Red-line rasbora ( Rasbora pauciperforata) of Malaysia and Indonesia has markings and coloring very similar to H. erythrozonus, but is a member of Family Cyprinidae rather than a close relative.
Like all small tetras, H. erythrozonus are happiest, most active, and most aesthetically pleasing when in a shoal. A minimum aquarium length of 60 cm will make them more comfortable when swimming. They prefer a well planted tank for hiding, but with some open water for free swimming. They should be a group of at least four with eight or more to make them feel secure. They tend to swim in smaller groups when a potential predator is present and swim freely when comfortable. They are often bought by aquarium owners to play a 'second fiddle' role to the neon tetra. Although they generally shoal separately from neons and cardinal tetras, they will often shoal alongside the latter, making an arresting visual spectacle.