Moenkhausia sp. (Blue-Eye Kogal Tetra)

31 May 2026

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The Blue-Eye Kogal Tetra, an undescribed Moenkhausia species, is a stunning and active schooling fish prized for its striking bright blue eyes and shimmering golden-silver body. Originating from South America, this peaceful yet energetic tetra adds a captivating gleam and dynamic movement to any well-planted community aquarium.

Overview

The Blue-Eye Kogal Tetra is a captivating and relatively rare freshwater fish in the aquarium hobby. Belonging to the diverse Moenkhausia genus, this undescribed species is highly sought after for its unique coloration, particularly its striking blue eyes. It is a hardy, active schooling fish that brings vibrant energy to community setups.

Image of blauaugen kogaltetra nz moenkhausia spec. kogal gold

Distribution and Habitat

While its exact taxonomic classification is still pending, this species originates from the warm, heavily vegetated river basins of South America. They are typically found in slow-moving tributaries and forest streams, where the water is often stained with tannins from decaying organic matter, creating a slightly acidic environment.

Description of Blue-Eye Kogal Tetra

Body shape:

It possesses a classic, laterally compressed, and somewhat deep-bodied tetra profile, allowing for quick, agile movements through the water.

Color:

The body exhibits a shimmering golden-silver base, often overlaid with a subtle, dark horizontal band or brownish mottling along the lateral line.

Barbels:

Like all characins, this species does not possess barbels.

Snout:

The snout is short and relatively blunt, with a terminal mouth suited for mid-water feeding.

Eyes:

The most defining feature is the upper half of the iris, which glows with an intense, iridescent blue color.

Fins:

The fins are largely translucent, sometimes displaying faint yellowish or whitish tints at the edges.

The Tail:

It features a deeply forked, transparent caudal fin that aids in its swift swimming capabilities.

Temper

This is a peaceful species that generally ignores other tank mates. They are excellent community fish but can be slightly boisterous among themselves during feeding or mating displays.

Sociality

They are highly social and must be kept in a school of at least 6 to 8 individuals. Keeping them in larger groups reduces stress and encourages their best colors and natural behaviors.

Activity

Blue-Eye Kogal Tetras are diurnal and highly active. They predominantly occupy the middle to upper levels of the aquarium, constantly darting around in a loose school.

Keeping and Caring for Blue-Eye Kogal Tetra

Tank size:

A minimum tank size of 80 liters (approximately 20 gallons) is recommended to provide ample swimming space for a small school.

Water Parameters:

Temperature

They thrive in tropical temperatures ranging from 23 to 27°C (73-81°F).

pH

A slightly acidic to neutral pH between 6.0 and 7.5 is ideal.

Hardness

Soft to moderately hard water, around 2-15 dGH, suits them best.

Ammonia, Nitrite, Nitrate

Ammonia and Nitrite must be strictly maintained at 0 ppm, while Nitrates should be kept below 20 ppm through regular water changes.

Lighting

Moderate to dim lighting is preferred. Floating plants can be used to diffuse bright lights and make the fish feel more secure.

Water flow

A moderate water flow mimics their natural stream habitats and provides good oxygenation.

Decorations and Plants

A dark substrate, driftwood tangles, and dense background planting will bring out their best colors. Dried leaf litter can be added to simulate a natural blackwater environment.

Diet

They are unfussy omnivores. In the aquarium, they will readily accept high-quality dry flakes and micro-pellets. This should be supplemented with live or frozen foods such as daphnia, brine shrimp, and bloodworms to ensure optimal health and coloration.

Some Feeding Tips

Feed them small amounts once or twice a day—only what they can consume within two minutes. Offering a varied diet is key to maintaining their vibrant blue eyes and golden sheen.

Breeding

Like many tetras, they are egg-scatterers that exhibit no parental care. To breed them, set up a separate dimly lit breeding tank with soft, acidic water and fine-leaved plants like Java Moss or a spawning mop. Condition the adults with live foods, introduce them to the breeding tank, and remove them promptly after spawning to prevent them from eating the eggs. The fry will hatch in a few days and require infusoria until they are large enough to eat baby brine shrimp.

Conclusion

The Blue-Eye Kogal Tetra is a stunning, active, and peaceful addition to the freshwater community aquarium. Their hardiness makes them suitable for intermediate aquarists, while their unique golden bodies and piercing blue eyes offer a visual treat that rivals many of the most popular tetra species.

Fish info

Care level: Easy - Moderate
Temperament: Peaceful
Adult size: 5-6 cm
Life expectancy: 3-5 years
Fish type: Tetra
Temperature : 23-27°C
pH: 6.0-7.5
Color Form: Blue, Brown, Gold, Silver

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