Black Emperor Tetra - 2.5cm

Species Profile

• Scientific Name: Nematobrycon palmeri var
• Common Name: Black Emperor Tetra
• Adult Size: 1.5 to 2 inches (3.8 to 5 cm)
• Life Expectancy: 4 to 6 years
• Habitat: Native to slow-moving rivers and streams in western Colombia; typically found in shaded areas with dense vegetation and soft, acidic water

Tank Requirements

• Minimum Tank Size: 15 gallons (57 liters) for a small group; 20+ gallons recommended for best behavior
• Ideal Temperature: 73–81°F (23–27°C)
• pH Range: 5.5–7.5
• Water Hardness: Soft to moderately hard (3–10 dGH)
• Temperament: Peaceful and calm; best kept in groups of 6 or more; males may display mild aggression during mating displays but are generally community-safe

Diet & Nutrition

• Omnivorous: Yes — enjoys a varied diet of high-quality flakes or micro pellets, supplemented with small live or frozen foods such as brine shrimp, bloodworms, and daphnia. Occasional veggie-based foods (like spirulina flakes) are also beneficial.

Appearance

• Slender, elongated body with a shimmering purple or blue hue
• Prominent horizontal black stripe running from eye to tail
• Long flowing fins, especially in males, with hints of yellow and black edging
• Eyes have a metallic green or blue glow, depending on lighting

Distinctive Features

• Elegant, regal look with subtle iridescence — hence the name "Emperor"
• Males have longer dorsal and anal fins and more intense coloration than females
• Ideal for planted aquariums with low to moderate lighting
• Will form small hierarchies in groups, often with subtle fin displays