Glowlight Tetra M
The Glowlight Tetra (Hemigrammus erythrozonus) is one of the most popular small tetras due to its elegant appearance and calm character.
Size: 4–5 cm maximum.
Appearance: transparent to silver body with a striking orange-red luminous line that starts from the eye and ends at the tail.
Eyes: have a characteristic metallic orange/red glow.
Behavior: peaceful, lively schooling fish. Looks best in groups.
Lifespan: 3–5 years in the right conditions.
Minimum aquarium size: 60 cm long (70+ liters) for a school.
Schooling fish: at least 8–10 individuals to feel secure.
Temperature: 23–28 °C.
pH: 5.5–7.5 (ideally slightly acidic).
Hardness (dGH): 2–12.
Water flow: gentle, with good filtration.
Decoration: planted aquarium, with shade from surface plants, wood and leaves that imitate blackwater. Needs open space for swimming.
Lighting: moderate. In lower lighting the light strip looks more intense.
Omnivorous. Feeds on flakes, micropellets, frozen and live foods (artemia, daphnia, bloodworms).
For vibrant colors, variety in the diet is recommended.
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Phylum: Chordata
Class: Actinopterygii (ray-finned fish)
Order: Characiformes
Family: Characidae (charfishes – includes most small tetras)
Genus: Hemigrammus
Species: Hemigrammus erythrozonus
Distribution: Native to Guyana (South America).
Habitat: calm streams and tributaries with dense vegetation and often "blackwater" rich in tannins from leaves and wood.
The waters are usually soft, acidic and shaded by tropical vegetation.
Very peaceful, ideal for social aquariums with other small tetras, rasboras, corydoras and shrimp.
Avoid keeping with large or aggressive fish.
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