Congo Tetra

Congo TetraThe Congo Tetra (Phenacogrammus interruptus) is a large, elegant freshwater tetra renowned for its shimmering rainbow colours and flowing fins. Native to the Congo River Basin in Africa, this species brings movement, colour, and presence to larger community aquariums. Congo Tetras are peaceful but active schooling fish that display their best colouration and behaviour in spacious, well maintained aquariums. When kept in proper groups with compatible

The Congo Tetra (Phenacogrammus interruptus) is a large, elegant freshwater tetra renowned for its shimmering rainbow colours and flowing fins. Native to the Congo River Basin in Africa, this species brings movement, colour, and presence to larger community aquariums.

Congo Tetras are peaceful but active schooling fish that display their best colouration and behaviour in spacious, well-maintained aquariums. When kept in proper groups with compatible tank mates, males develop stunning iridescent hues and extended fin rays that make this species a true centrepiece fish.

Physical Characteristics

• Adult Size: Approximately 7–9 cm (3–3.5 inches)

• Coloration: Iridescent blue, green, gold, and violet tones with translucent fins; males display longer, flowing fin extensions

• Body Shape: Slender, elongated tetra profile

• Sexual Dimorphism:

  • Males are larger, more colourful, and develop extended dorsal and caudal fin rays

  • Females are smaller with shorter fins and softer coloration

Behaviour & Temperament

• Temperament: Peaceful

• Tank Level: Mid to upper water column

• Schooling Behaviour: Should be kept in groups of 6 or more

• Activity Level: Active swimmer

Suitable Tank Mates

• Other peaceful medium to large tetras

• Corydoras and larger catfish

• Peaceful cichlids

• Gouramis

• Rainbowfish

Avoid:

• Fin-nipping species

• Very small or timid fish

• Aggressive or highly territorial species

Breeding Information

• Spawning Type: Egg scatterer

• Breeding Setup:

  • Soft, slightly acidic water

  • Dense plants or spawning mops

• Parental Care: None

• Notes: Adults may eat eggs; separation required for breeding attempts

Special Considerations

• Requires ample swimming space

• Best colouration achieved with stable water quality and subdued lighting

• Flowing fins may attract fin-nippers

• Sensitive to poor water conditions compared to smaller tetras

Aquarium Requirements

• Minimum Tank Size: 150 litres

• Water Temperature: 22–28°C

• pH Range: 6.0–7.5

• Water Hardness: 3–12 dGH

• Substrate: Sand or fine gravel

• Decor: Live plants, driftwood, shaded areas

• Filtration: Moderate, well-maintained

• Lighting: Moderate; plants help diffuse brightness

Diet & Feeding

• Diet Type: Omnivore

• Recommended Foods:

  • High-quality flakes or micro pellets

  • Frozen foods such as daphnia and brine shrimp

  • Occasional live foods for conditioning

• Feeding Frequency: Once or twice daily in small portions

We aim to provide up to date product information including ingredients, size and colour specifications, packaging and product features, as provided to us by the product manufacturer. As product details change from time to time, this information is intended as a guide only and some delay may occur in the updating of our listing. Product images are indicative of the appearance and the product delivered may vary slightly from the product image show. When precise information is important, we recommend that you read the label on the products you purchase or contact the manufacturer of the product.