They are often bought by aquarium owners to play a 'second fiddle' role to the neon tetra. They tend to swim in tighter groups when a potential predator is present and swim freely when comfortable. They should be a group of at least four with eight or more to make them feel secure. They prefer a well planted tank for hiding, but with some open water for free swimming. A minimum aquarium length of 60 cm will make them more comfortable when swimming. erythrozonus is happiest, most active, and most aesthetically pleasing when in a shoal. The feeding of vegetable matter is suggested to vary the diet. erythrozonus is an omnivore and in the aquarium eats small live, frozen and dry foods and flake foods. The hardiness of this fish allows it easily to adapt to harder water, though soft water is essential for captive breeding. The water should be soft to slightly hard, d°GH of 6° to 15°, with a slightly acidic pH of 6.8, in the range 6.0 – 7.5. It is best seen in the freshwater aquarium when kept in subdued lighting with a dark substrate. Golden and albino varieties are also sold. erythrozonus is readily available and usually inexpensive. In the wild, the fish eats aquatic insect larvae. It has a life span of two to four years when kept in good conditions. erythrozonus is a medium-sized tetra growing to 4 to 5 cm (1.6 to 2.0 in), notably larger than both neon and cardinal tetras. erythrozonus, but is a member of family Cyprinidae, not a close relative. The red-line rasbora ( Rasbora pauciperforata) of Malaysia and Indonesia has markings and coloring very similar to H. Hemigrammus gracilis is a senior synonym. ![]() It should be kept with similar sized, non-aggressive species. It is larger than the neon tetra, and its peaceful disposition makes it an ideal, and popular, community tank fish. The glowlight tetra is a peaceful, shoaling fish. ![]() 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 of the dorsal fin being the same color as the stripe. Hemigrammus erythrozonus, commonly known as the glowlight tetra, is a small tropical fish from the Essequibo River, Guyana, South America.
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