Black Ghost Knifefish

The Black Ghost Knifefish is a striking, nocturnal freshwater species known for its velvety black body and distinctive white tail bands. With its smooth, ribbon-like swimming motion and mysterious appearance, this unique fish makes a dramatic centerpiece in larger aquariums.

Tank Size:
Minimum 75 gallons (125+ gallons preferred for adults)

Adult Size:
Up to 18–20 inches

Temperature:
73–82°F (23–28°C)

pH Range:
6.0–7.5

Temperament:
Generally peaceful but territorial with other knifefish

Behavior:
Nocturnal and shy; prefers dim lighting

Tank Setup:
• Plenty of hiding spots (PVC tubes, caves, driftwood)
• Soft substrate
• Moderate filtration with stable water quality
• Tight-fitting lid
• Best kept with medium to large peaceful tankmates

Lifespan:
10–15 years with proper care

 Food

Black Ghost Knifefish are carnivorous:

• Frozen bloodworms (favorite)
• Brine shrimp
• Blackworms
• Small sinking carnivore pellets
• Occasional live foods

Feed in the evening when they are most active.

Fun Facts

• They use a weak electrical field to navigate and find food in dark water.
• Native to South America, especially the Amazon basin.
• They swim using a long undulating fin along their belly, allowing them to move forward and backward smoothly.
• Despite their name, they are not true “knifefish” in the traditional sense but belong to a unique electric fish group.
• They can recognize their owners over time and become surprisingly interactive.