Choosing Black Ghost Knifefish Tank Mates
Good Black Ghost Knifefish tank mates share the same temperature and pH window, will not be eaten by (or eat) the Black Ghost Knifefish, and do not compete for the same swimming zone or feeding time. Each pair guide below scores those factors from 0 to 100 and gives the minimum tank size for keeping both species together.
Start with the highest-scoring pairs; anything under 45 is listed so you know what to avoid, not as a recommendation.
Care baseline
The Black Ghost Knifefish is a unique and elegant addition to the aquarium. With a lifespan of 5-8 years, it requires a minimum tank size of 200 liters. It is a solitary fish with a low aggression level and moderate activity. Its slender body and silver-blue coloration make it a captivating sight.
| Temperature | 73–82°F |
| pH | 6.0–8.0 |
| Adult size | 18.0 in |
| Minimum group | 1 |