Congo Tetra - 5cm

Species Profile

• Scientific Name: Phenacogrammus interruptus
• Common Name: Congo Tetra
• Adult Size: 3 to 3.5 inches (7.5 to 9 cm), males can grow slightly larger
• Life Expectancy: 4–6 years, possibly longer with excellent care
• Habitat: Native to the Congo River Basin in Central Africa; inhabits slow-moving streams and marshy areas rich in vegetation

Tank Requirements

• Minimum Tank Size: 30 gallons for a small group (6+); larger tanks preferred for better schooling behavior
• Ideal Temperature: 73–82°F (23–28°C)
• pH Range: 6.0–7.5
• Water Hardness: 3–18 dGH
• Temperament: Peaceful and social; thrives in groups; ideal for community tanks with similarly sized, non-aggressive fish

Diet & Nutrition

• Omnivorous: Yes
  • Eats a variety of foods including flakes, pellets, frozen, and live foods

  • Enjoys daphnia, brine shrimp, bloodworms, and vegetable matter such as blanched spinach or spirulina-based foods

Appearance

• Iridescent body with shimmering hues of blue, violet, orange, and green depending on lighting and angle
• Males are more colorful and have longer, flowing fins than females
• Slightly compressed, deep-bodied shape

Distinctive Features

• Flowing caudal fin in males with a central lobe, giving it a lyre or trident shape
• Reflective, rainbow-like coloration that intensifies with good diet and water conditions
• One of the most visually striking tetras, especially in mature males
• Known for their peaceful schooling behavior and active swimming in the middle to upper levels of the tank