The Black Ghost Knifefish (Apteronotus albifrons) is one of the most fascinating and exotic freshwater species available to aquarists. Known for its jet-black body, white tail bands, and mesmerizing swimming pattern, this fish adds mystery and elegance to any large aquarium.

At 5–6 cm when sold, the Black Ghost Knifefish can grow up to 40–50 cm (16–20 inches) as an adult, making it suitable only for large, well-maintained tanks. This species is beloved for its unique locomotion using a specialized fin, allowing it to glide effortlessly forward and backward.

✅ Key Features

• Size: 5–6 cm (juvenile), up to 50 cm adult

• Temperament: Peaceful but territorial with its own kind

• Care Level: Advanced

• Lifespan: 10–15 years under proper care

• Special Trait: Generates weak electric fields for navigation and hunting

Care Guide for Black Ghost Knifefish

✅ Tank Requirements

• Minimum Tank Size: 250 liters (65 gallons) for juveniles; 400+ liters for adults

• Aquascape: Provide dim lighting, soft sand substrate, driftwood, caves, and plants for hiding spaces

• Lighting: Low to moderate (nocturnal species prefers subdued light)

• Cover: Tight lid – known jumpers when startled

Tip: Use long, smooth PVC pipes or hollow logs as hiding spots.

✅ Water Parameters

• Temperature: 24°C – 28°C (75°F – 82°F)

• pH Level: 6.0 – 7.5

• Water Hardness: 2 – 12 dGH (soft water preferred)

• Filtration: Strong filtration with excellent oxygenation

• Water Changes: 30–40% weekly for pristine conditions

✅ Feeding Habits

Black Ghost Knifefish are carnivorous and nocturnal feeders.

• Recommended Diet:

  • Live or frozen bloodworms

  • Brine shrimp

  • Blackworms

  • High-quality sinking carnivore pellets

Feed at night or during dim light conditions, as they are shy eaters.

✅ Tank Mates

The Black Ghost Knifefish is peaceful but predatory, so avoid small fish that can fit in its mouth.

Ideal Tank Mates:

• Large peaceful cichlids (Severum, Geophagus)

• Silver Dollars

• Gouramis

• Plecos and other large catfish

Avoid: Aggressive species and other knifefish to prevent territorial disputes.

✅ Behavior & Breeding

• Behavior: Nocturnal, secretive, and intelligent; can recognize owners

• Breeding: Extremely rare in home aquariums; requires specialized setups

Why Choose Black Ghost Knifefish?

• Exotic and mesmerizing swimming style

• Peaceful yet captivating centerpiece fish for large aquariums

• Long-lived and highly intelligent

• Perfect for experienced aquarists seeking something unique

✅ Ideal for dimly lit, well-aquascaped large tanks
✅ A true showpiece species for any advanced collection