The Glowlight Tetra (Hemigrammus erythrozonus) is a peaceful, schooling freshwater fish native to the Essequibo River in Guyana. Famous for its striking iridescence and calm temperament, this small characin is a staple favorite in planted aquariums and community tank setups.
Key Characteristics & Appearance
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Signature Neon Stripe: Features a translucent, silver-peach body highlighted by a brilliant, neon-orange to red horizontal stripe running from its snout directly to the base of its tail.
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Distinct Eyewear: The upper rim of its eye reflects a bright orange-red glow, complementing its body stripe.
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Subtle Finnage: Clear, delicate fins with subtle white or red tips on the dorsal fin, adding a soft accent as it swims.
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Size: Compact size, reaching a mature length of about 1.5 inches (3.8 cm).
Behavior & Temperament
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Strictly Peaceful Community Member: Extremely mild-mannered and non-aggressive, making it ideal for community aquariums with non-predatory tankmates.
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Schooling Instinct: Best kept in groups of 6 or more (ideally 10+). When housed in a proper school, they display tighter swimming patterns, show bolder coloration, and feel significantly more secure.
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Mid-Water Swimmers: Occupies the middle and lower levels of the tank, contrasting beautifully with top-dwelling fish.
Care & Aquarium Setup
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Minimum Tank Size: 10 gallons for a small shoal, though a 20-gallon long tank allows better room for schooling behavior.
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Aquarium Decor:
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Dark Substrate: Dark gravel or sand dramatically enhances the neon pop of their red-orange stripe.
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Aquascaping: Prefers heavily planted tanks with driftwood, soft leaf structures, and floating plants to offer shaded areas.
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Water Parameters:
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Temperature: $74^\circ\text{F} – 82^\circ\text{F}$ ($23^\circ\text{C} – 28^\circ\text{C}$).
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pH: Slightly acidic to neutral ($5.5 – 7.5$).
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Hardness: Soft to medium ($2 – 15\text{ dGH}$).
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Diet & Nutrition
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Omnivorous Eater: Unfussy feeders that accept most high-quality micro-pellets and flake foods.
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Varied Diet: Supplement regularly with live or frozen treats such as baby brine shrimp, daphnia, or small bloodworms to encourage peak color intensity.




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