Red Eye Tetra: Species Profile

The Red Eye Tetra (Moenkhausia sanctaefilomenae) is a popular freshwater fish known for its distinctive red eye and peaceful demeanor. Originating from the river basins of South America, this species is a favored choice among aquarists due to its hardiness and compatibility with various tank mates.

Species Overview

• Common Names: Red Eye Tetra, Yellow-banded Tetra
• Scientific Name: Moenkhausia sanctaefilomenae
• Adult Size: Approximately 2.75 inches (7 cm)
• Life Expectancy: Up to 5 years

Characteristics

• Family: Characidae
• Origin: São Francisco, upper Paraná, Paraguay, and Uruguay river basins in South America
• Social: Peaceful, schooling
• Tank Level: Midwater
• Minimum Tank Size: 20 gallons
• Diet: Omnivore
• Breeding: Egglayer; moderately challenging in captivity
• Care Level: Beginner
• pH: 6.0 to 7.5
• Hardness: 4 to 12 dGH
• Temperature: 72–78°F (22–26°C)

Origin and Distribution

Red Eye Tetras are native to the freshwater rivers and streams of South America, particularly in the São Francisco, upper Paraná, Paraguay, and Uruguay river basins. They inhabit slow-moving waters with abundant vegetation, providing ample hiding spots and feeding grounds.

Colors and Markings

This species features a silver body with a distinctive red ring around the eye, giving it its common name. The tail fin is adorned with a black band edged in white, adding to its striking appearance.

Tankmates

Red Eye Tetras are peaceful and do well in community tanks with other non-aggressive species. Suitable tankmates include:

• Other small tetras
• Rasboras
• Corydoras catfish
• Dwarf gouramis
• Livebearers like guppies and platies

It’s advisable to avoid housing them with larger, aggressive fish or fin-nippers that might harass them.

Habitat and Care

To replicate their natural habitat:

• Tank Setup: Provide a well-planted aquarium with open swimming areas. Incorporate fine-leaved plants, driftwood, and rocks to offer hiding spots and mimic their natural environment.
• Water Parameters: Maintain stable water conditions within the recommended pH and hardness ranges. Regular water changes are essential to keep the environment clean and healthy.
• Lighting: Moderate lighting is preferred, which can be achieved with floating plants to diffuse light.

Diet and Feeding

Red Eye Tetras are omnivorous and thrive on a varied diet:

• High-quality flake or micro-pellet food
• Live or frozen foods such as brine shrimp, daphnia, and bloodworms
• Occasional vegetable matter like blanched spinach or zucchini

Feed them small portions multiple times daily, ensuring they consume the food within a few minutes to prevent overfeeding and maintain water quality.

Gender Differences

Males are generally more colorful with a slimmer body, while females have a rounder abdomen, especially when carrying eggs.

Breeding

Breeding Red Eye Tetras in captivity is moderately challenging:

• Breeding Tank: Set up a separate tank with fine-leaved plants or spawning mops. Maintain slightly acidic to neutral water with a temperature around 78°F (26°C).
• Spawning: Introduce a conditioned male and female pair. Spawning typically occurs in the early morning, with the female scattering eggs that the male fertilizes.
• Raising Fry: After spawning, remove the adults to prevent them from eating the eggs. Eggs hatch within 24–36 hours, and fry can be fed infusoria or commercially prepared fry food until they are large enough to accept standard foods.

Further Research

For those interested in similar species, consider exploring:

• Black Phantom Tetra (Hyphessobrycon megalopterus)
• Serpae Tetra (Hyphessobrycon eques)
• Ember Tetra (Hyphessobrycon amandae)

These species share comparable care requirements and can coexist harmoniously in a community aquarium.

FAQ

• How many Red Eye Tetras should be kept together? It’s best to keep them in groups of at least six to promote natural schooling behavior and reduce stress.
• Are Red Eye Tetras suitable for beginners? Yes, their hardy nature and ease of care make them excellent choices for novice aquarists.
• Can Red Eye Tetras live with other fish? Yes, they can coexist with other peaceful, similarly sized fish. However, avoid housing them with larger or aggressive species to prevent potential conflicts.

By providing appropriate care and a suitable environment, Red Eye Tetras can be a lively and colorful addition to any freshwater aquarium.