Black Emperor Tetra

The Black Emperor Tetra is a striking and elegant freshwater fish known for its deep dark body tones, iridescent highlights, and distinctive extended finnage in males. A slightly more assertive tetra species, Black Emperor Tetras display fascinating social behaviour and are best kept in well-structured groups within spacious community aquariums.

When housed correctly, males develop intense coloration and graceful fin extensions, making this species a standout choice for planted aquariums and aquascapes.

Physical Characteristics

• Adult Size: Approximately 4–5 cm (1.5–2 inches)

• Coloration: Dark charcoal to black body with subtle blue or purple iridescence; lighter underbelly

• Body Shape: Slender, elongated tetra profile

• Sexual Dimorphism:

  • Males develop longer dorsal and caudal fin extensions

  • Females are slightly larger and rounder with subtler colouration

Behaviour & Temperament

• Temperament: Semi-peaceful

• Tank Level: Mid-water

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

• Activity Level: Males establish dominance hierarchies but rarely cause harm when properly grouped

Suitable Tank Mates

• Other medium-sized tetras

• Rasboras

• Corydoras catfish

• Dwarf cichlids (peaceful species, Bolivian Rams)

• Small gouramis

• Catfish

Avoid:

• Very small or timid fish

• Aggressive or highly territorial species

• Fin-nippers

Breeding Information

• Spawning Type: Egg scatterer

• Breeding Setup:

  • Soft, slightly acidic water

  • Fine-leaved plants or spawning mops

• Parental Care: None

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

Special Considerations

• • Mild male aggression can occur in small groups

  • Best colour achieved with stable water quality and subdued lighting

  • Prefers planted aquariums with visual breaks

  • Avoid overcrowding to reduce stress

Aquarium Requirements

• Minimum Tank Size: 60-80 litres

• Water Temperature: 22–28°C

• pH Range: 5.5–7.5

• Water Hardness: 2–10 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

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