The Black Knife Fish is a fascinating and mysterious freshwater species, admired for its long, sleek body and elegant, gliding swimming style. Its jet-black coloration and knife-shaped profile make it one of the most unique and eye-catching fish for larger aquariums. Calm, graceful, and active at night, this fish adds movement and character to any display tank.
Ideal for aquarists looking for something rare, stylish, and mesmerizing.
🌟 Key Highlights
✔ Jet-black body with smooth, streamlined shape
✔ Gliding, ghost-like swimming behavior
✔ Calm and peaceful with larger tankmates
✔ Highly unique showpiece fish
✔ Becomes more confident and interactive over time
🧪 Water Parameters
Temperature: 24–28°C
pH: 6.5–7.5
Tank Size: 4 ft or larger
Water Type: Clean, well-filtered freshwater
🍽️ Diet
Black Knife Fish enjoy a protein-rich diet:
Bloodworms
Brine shrimp
Sinking carnivore pellets
Small fish or shrimp (occasionally)
Feed at night or low light for best results.
🏡 Tank Requirements
✔ Large tank with hiding spaces: caves, pipes, driftwood
✔ Soft lighting or shaded areas
✔ Good filtration and oxygenation
✔ Peaceful tankmates: silver dollars, severums, geophagus, large tetras
🛑 Avoid fin-nippers or aggressive predators
❤️ Why Choose Black Knife Fish from Blessings Aquarium?
🌟 Well-quarantined fish for safe introduction
🌟 Premium quality, healthy and active specimens
🌟 Rare and attractive showpiece fish
🌟 Perfect for large community or semi-aggressive setups
🌟 Adds elegance, mystery, and movement to your aquarium
 
*Due to natural variations, the product may differ  in appearance from the picture provided.*