Glowlight Tetra – Hemigrammus Erythrozonus

The Glowlight Tetra is a small, peaceful freshwater fish that is highly popular in home aquariums. Known for its distinctive orange-red stripe that runs along the middle of its body, it is an ideal choice for beginner and seasoned aquarium enthusiasts alike. This species is active and social, making it an excellent addition to a community tank.

Quick Overview

Common Names: Glowlight Tetra
Scientific Name: Hemigrammus Erythrozonus
Popularity: Very Popular
Adult Size: 1.5 inches (4 cm)
Lifespan: 3-5 years
Sexing: Males are slightly smaller with more intense coloration, while females are rounder-bodied.
Temperature: 72-80°F (22-27°C)
pH Range: 6.0 – 7.5
Water Hardness: 2-10 dGH
Nature: Peaceful, active, and schooling fish.

Natural Habitat & Origin

The Glowlight Tetra originates from the streams and rivers of the Amazon Basin in South America, specifically in countries like Brazil, Guyana, and Venezuela. These fish thrive in the slow-moving, clear waters of tropical environments, where they are commonly found among dense vegetation. They prefer areas with submerged branches, plants, and leaf litter.

Appearance & Size

Glowlight Tetras are small fish with a striking orange-red stripe that extends from their nose to the base of their tail. The body itself is translucent, showcasing a slight shimmer under the right lighting. As juveniles, they are less vibrant, with the full intensity of their coloration developing as they mature. Adults typically grow to about 1.5 inches (4 cm) in length, making them suitable for smaller aquariums.

Tank Requirements

Minimum Tank Size: 10 gallons (38 liters)
Preferred Tank Setup: A well-planted aquarium with plenty of swimming space. They appreciate soft, slightly acidic water and a calm flow.
Substrate and Decorations: Fine gravel or sand as a substrate, with various plants and smooth rocks for hiding and swimming.
Tank Mate Options: Peaceful community fish like Corydoras, Neon Tetras, and Guppies.
Avoid: Aggressive or larger fish such as Cichlids or predatory species that may view them as food.

Water Parameters & Conditions

Temperature: 72-80°F (22-27°C)
pH Range: 6.0 – 7.5
Water Hardness: 2-10 dGH (soft to moderately hard water)
Filtration & Oxygenation: A gentle filter is ideal to maintain water quality. Proper oxygenation should be ensured.
Lighting: Moderate lighting, which enhances the glow of their orange stripe while simulating their natural habitat.

Diet & Feeding

Glowlight Tetras are omnivorous, enjoying a varied diet that includes high-quality flake food, micro-pellets, and occasional live or frozen food.
Recommended Foods: Flake foods, brine shrimp, daphnia, and micro-worms.
Feeding Frequency: Feed small amounts 2-3 times a day.

Behaviour & Compatibility

Glowlight Tetras are peaceful and active swimmers that do well in schools of 6 or more individuals. They are very social and thrive in community tanks with similarly calm fish.
Good Tank Mates: Other small tetras, peaceful species such as Rasboras, and Corydoras Catfish.
Avoid: Aggressive fish such as large Cichlids or Barbs that may harass them.

Breeding

Breeding Glowlight Tetras can be relatively easy under the right conditions. It’s recommended to set up a separate breeding tank with a soft substrate, such as marbles, to prevent the adults from eating the eggs. Males will often court females by swimming alongside them, showing off their vibrant colors. After spawning, the eggs hatch in about 24 to 48 hours, and the fry will begin to swim freely after a few days. It’s important to provide finely crushed food or liquid fry food for the young fish.

Common Health Issues & Prevention

While generally hardy, Glowlight Tetras can be susceptible to diseases common to freshwater fish, such as Ich, fin rot, and fungal infections. Maintaining stable water conditions, avoiding overcrowding, and feeding a varied diet can prevent many of these issues. Regular water changes and observing fish behavior for early signs of illness also contribute to their overall health.

• Ich: Caused by a parasite, treated by raising water temperature slightly and using medicated treatments.
• Fin Rot: Often caused by poor water quality, treated by improving conditions and using antibiotics if necessary.

Glowlight Tetra Fun Facts

• The Glowlight Tetra gets its name from the vibrant red-orange stripe that “glows” under the right lighting.
• These fish are schooling fish, and they feel safest when kept in groups of at least six.
• They are considered excellent fish for beginner aquarists due to their peaceful nature and ease of care.
• Glowlight Tetras have been popular in the aquarium trade for decades due to their attractive appearance and calm temperament.