Blue Emperor Tetra L – Large Elegant Community Fish

Blue Emperor Tetra L is a stunning variant of the Emperor Tetra (Nematobrycon palmeri), prized for its iridescent blue sheen, elongated fins, and graceful swimming behavior. The “L” size indicates larger, more mature specimens, showcasing fuller finnage and more intense coloration.

This species is native to Colombian river systems, where it inhabits slow-moving, shaded waters rich in vegetation. In aquariums, Blue Emperor Tetras stand out as a centerpiece schooling fish, especially when kept in groups and under proper lighting that enhances their shimmering blue body.

Males are particularly eye-catching, often displaying extended caudal fin filaments and stronger coloration, while females tend to be slightly smaller with a more subtle appearance. Their calm yet active nature makes them a great addition to planted aquariums and aquascapes.

Key Features

• Variant of Emperor Tetra (Nematobrycon palmeri)

• Beautiful iridescent blue coloration

• “L” size – larger, more developed fish

• Elegant elongated fins (especially in males)

• Peaceful and community-friendly

• Ideal for planted aquariums

Size

• Adult size: 5 – 6 cm

• “L” specimens are near or at full adult size

• Males may appear larger due to extended fins

Temperament

Blue Emperor Tetra L is generally peaceful with mild territorial behavior among males.

• Best kept in groups of 6–8 or more

• Males may display toward each other (non-lethal)

• Active mid-water swimmer

• Suitable for peaceful community setups

Water Conditions

Stable water conditions are essential for health and coloration.

• Temperature: 23 – 28°C (73 – 82°F)

• pH: 5.5 – 7.5

• GH: 3 – 12 dGH

• Ammonia/Nitrite: 0 ppm

• Nitrate: < 20 ppm

Perform 20–30% weekly water changes.

Tank Setup

Blue Emperor Tetras thrive in planted aquariums with natural décor.

Recommended setup includes:

• Dense plants along sides and background

• Open swimming space in the center

• Driftwood and shaded areas

• Soft substrate

• Gentle to moderate water flow

Minimum tank size: 80 liters (~20 gallons) for a group.

Feeding Habits

Blue Emperor Tetra L are omnivores and easy to feed.

Diet can include:

• High-quality flakes or pellets

• Frozen foods (bloodworms, brine shrimp, daphnia)

• Live foods for enhanced coloration

• Occasional vegetable-based foods

Feed 1–2 times daily in small portions.

Tank Mates

Suitable for peaceful community aquariums.

Suitable tank mates:

• Other tetras

• Rasboras

• Corydoras

• Dwarf cichlids

• Gouramis

Tank mates to avoid:

• Large aggressive fish

• Fin-nippers (may target fins)

Care and Maintenance

To keep Blue Emperor Tetra L healthy:

• Keep in groups for natural behavior

• Maintain stable water parameters

• Provide balanced diet

• Perform regular water changes

• Ensure adequate swimming space

With proper care, they can live 5–6 years.

Why Choose Blue Emperor Tetra L?

• Stunning blue iridescent coloration

• Elegant long fins and graceful movement

• Larger L size for better display

• Peaceful and community friendly

• Perfect for planted aquariums

Blue Emperor Tetra L is a refined and eye-catching fish that adds elegance, color, and movement to any aquarium. Its shimmering blue tones and calm behavior make it a perfect centerpiece for planted and community tanks. 🐟🌿