B
Black Ghost Knife Fish
Apteronotus albifrons
VS
P
Pajama Cardinalfish
Sphaeramia nematoptera
Choosing between Black Ghost Knife Fish and Pajama Cardinalfish? Both are excellent choices, but they have different care requirements and temperaments. Use the detailed comparison below to make an informed decision based on your experience level, tank size, and community goals.
Black Ghost Knife Fish
Apteronotus albifronsVS
Pajama Cardinalfish
Sphaeramia nematopteraCommon Name
Black Ghost Knife Fish
Pajama Cardinalfish
Scientific Name
Apteronotus albifrons
Sphaeramia nematoptera
Type
Freshwater
Saltwater / Marine
Difficulty
Advanced
Beginner Friendly
Temperament
Semi-Aggressive
Peaceful
Minimum Tank
75 gallons
20 gallons
Recommended Tank
100 gallons
30 gallons
Temperature
73°F - 80°F
72°F - 78°F
pH Range
6 - 8
8.1 - 8.4
Max Size
20 inches
3 inches
Lifespan
10-15 years
5-8 years
Diet
Live or frozen bloodworms, Krill, Pellets, Small fish
Marine pellets, Frozen Mysis shrimp, Frozen brine shrimp, Marine flakes
Black Ghost Knife Fish
✓ Good For
Pajama Cardinalfish
✓ Good For
- Community tanks
- Beginners
- Schooling displays
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