🐠 Congo Tetra – Sub-adult

Phenacogrammus interruptus | Iridescent African schooling fish with flowing finnage and unmatched elegance

Transform your aquarium with the breathtaking beauty of the Congo Tetra. Widely regarded as one of the world's most spectacular freshwater tetras, Phenacogrammus interruptus is admired for its shimmering rainbow iridescence, graceful flowing fins, and peaceful schooling behavior.

Its brilliant coloration and elegant movement make it a true centerpiece for planted aquariums, large community tanks, and premium aquascapes.

✨ Why aquarists love Congo Tetras

✔️ Brilliant rainbow iridescence — shimmering blues, greens, golds, and violets that change with the light
✔️ Elegant flowing finnage — mature specimens develop long, graceful fins with exceptional display value
✔️ Peaceful schooling species — stunning synchronized swimming when maintained in groups
✔️ Premium ornamental tetra — one of the largest and most beautiful tetra species available
✔️ Ideal centerpiece schooling fish — combines beauty, size, and graceful movement

🌍 About the species

Phenacogrammus interruptus is native to the Congo River Basin in the Democratic Republic of the Congo, where it inhabits slow-moving rivers, flooded forests, and densely vegetated waterways.

These fish are known for:

• Spectacular iridescent body coloration
• Flowing dorsal, caudal, and anal fins in mature males
• Graceful and synchronized schooling behavior
• Calm and peaceful temperament
• Strong visual impact under natural and planted aquarium lighting

Their constantly shifting iridescent colors make them one of the most captivating freshwater fish in the aquarium hobby.

🏡 Ideal aquarium setup

Congo Tetras thrive best in:

• Large planted aquariums
• Community tanks
• Nature-style aquascapes
• African biotope aquariums
• Mature freshwater systems

Recommended setup:

• 120 liters or larger
• Dense planting with generous open swimming areas
• Gentle to moderate water movement
• Stable water parameters
• Efficient biological filtration

⚠️ Compatibility notes

Congo Tetras are peaceful schooling fish and do best with similarly peaceful tankmates.

Not ideal with:

• Large predatory fish
• Aggressive cichlids
• Persistent fin-nipping species
• Highly territorial fish

Best suited for:

✔️ Community aquariums
✔️ Planted tanks
✔️ African biotope aquariums
✔️ Intermediate and experienced aquarists

🚚 Professionally packed for live arrival

Every shipment is treated as a live biological transport, not a standard parcel.

Your fish are packed using:

• Oxygen-filled fish bags
• Temperature-insulated packaging
• Shock-absorbing thermocol protection
• Fastest safe transport routes available

This minimizes transit stress and improves live arrival success.

🛡️ Live Arrival Guaranteed*

Instant Refund for DoAs in accordance with our Refund Policy.

👉 You are not taking the risk alone.

🧭 Is this right for you?

✔️ You want one of the world's most beautiful schooling fish
✔️ You maintain a large planted or community aquarium
✔️ You appreciate elegant fish with spectacular iridescent coloration
✔️ You are looking for a premium centerpiece schooling species

⚠️ Not ideal if:

• You keep aggressive or fin-nipping species
• Your aquarium is too small for active schooling fish
• You prefer solitary centerpiece fish
• You maintain overcrowded community aquariums

🔬 Nero Labs Standard

These fish are maintained with:

• Controlled batch monitoring
• Observation-based selection
• Stress-aware handling
• Survival-focused transport preparation

We prioritize long-term health, structural quality, coloration, and behavioral stability over bulk-volume movement.

👉 Experience the elegance of Africa's most iconic tetra

Discover the shimmering colors, graceful movement, and timeless beauty of the Congo Tetra (Phenacogrammus interruptus) from Nero Labs.

Congo Tetra (Phenacogrammus interruptus)

Description

The Congo Tetra (Phenacogrammus interruptus), offered by Nero Labs, is a selectively maintained ornamental African characin recognized for its remarkable iridescent coloration, flowing finnage, and peaceful schooling behaviour. Native to the Congo River Basin in Central Africa, this species inhabits slow-moving rivers, flooded forests, and densely vegetated freshwater systems where soft lighting and abundant aquatic vegetation enhance its natural brilliance.

Body coloration typically presents as shimmering silver with iridescent blue, green, violet, and golden reflections that change dynamically with viewing angle and lighting conditions. Mature males develop elongated dorsal, anal, and caudal fin extensions, giving the species its distinctive flowing appearance, while females display a fuller body profile with comparatively shorter finnage and more subdued coloration. Colour intensity and finnage development improve progressively with maturity, balanced nutrition, and stable environmental conditions.

Behaviour is peaceful, active, and strongly schooling-oriented. Individuals display graceful synchronized swimming and establish cohesive social hierarchies when maintained in appropriate groups. Their calm temperament allows excellent compatibility with other peaceful community species, while their continuous movement and brilliant iridescence make them a natural focal point in spacious planted aquaria.

Specimens supplied are lab-reared and system-acclimated within controlled, closed-system environments, minimizing early-life stress and supporting reliable long-term adaptation to aquarium conditions. This lineage represents domesticated ornamental stock maintained for colour brilliance, finnage quality, and behavioural stability rather than wild ecological function or conservation deployment.

System & Rearing Notes

Origin: In-house, Nero Labs
Rearing environment: Controlled, closed system
Line status: Selectively maintained ornamental African characin
Behaviour: Peaceful, active, schooling
Swimming profile: Midwater, graceful synchronized movement
Feeding behaviour: Omnivorous; accepts prepared, frozen, and live feeds
Habitat preference: Spacious planted aquaria with open swimming areas, subdued lighting, and gentle to moderate water movement
Colour development: Progressive; iridescent blue, green, violet, and golden reflections intensify with maturity and environmental stability
Sexual dimorphism: Pronounced; males develop elongated flowing finnage and more intense iridescence

Minor variation in iridescent colour intensity, finnage length, and body proportions may occur between individuals and reflects normal biological diversity within maintained ornamental populations.

Availability & Use

Availability of Congo Tetras is cycle-dependent and determined by biological readiness rather than inventory-driven targets. This species is suitable for intermediate to advanced aquarists seeking an elegant and visually spectacular schooling fish.

Best suited for large planted community aquaria, African river-inspired freshwater systems, and premium display aquaria emphasizing graceful schooling behaviour, flowing finnage, and exceptional iridescent colouration.

Important Note

Congo Tetras should be maintained in groups to encourage natural schooling behaviour and maximize colour expression. Spacious aquaria, subdued lighting, stable water quality, and peaceful tankmates are essential for maintaining their flowing finnage and full iridescent brilliance.

Ethical & Operational Context

Distribution of Congo Tetras through Nero Labs prioritizes organism welfare, lineage integrity, and responsible propagation of ornamental African characins. Proceeds support refinement of characin husbandry protocols, behavioural observation programs, and applied ornamental aquaculture initiatives.