Black Ghost Knifefish and X Ray Tetra Compatibility Overview
Black Ghost Knifefish and X Ray Tetra are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Black Ghost Knifefish | X Ray Tetra | Verdict |
|---|---|---|---|
| Temperature | 73โ82ยฐF | 72โ82ยฐF | โ 73โ82ยฐF |
| pH Range | 6.0โ8.0 | 6.0โ7.5 | โ 6.0โ7.5 |
| Temperament | semi | peaceful | โ ๏ธ Monitor |
| Adult Size | 18.0 in | 1.8 in | โ 10ร difference |
| Min. Group | 1+ | 6+ | See below |
| Min. Tank Size | 100 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
Black Ghost Knifefish โ Apteronotus albifrons
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.
โ Full Black Ghost Knifefish care guide
X Ray Tetra โ Pristella maxillaris
The Pristella maxillaris, also known as the X-Ray Tetra, is a popular freshwater fish known for its unique appearance and peaceful nature. They are slender and iridescent, with a clear, almost x-ray-like body. They are best kept in groups of 6 or more and thrive in well-planted tanks with a moderate water flow.
Frequently Asked Questions
Can Black Ghost Knifefish live with X Ray Tetra?
Generally not recommended. Black Ghost Knifefish and X Ray Tetra are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Black Ghost Knifefish and X Ray Tetra together?
A minimum of 100 gallons is recommended for keeping Black Ghost Knifefish and X Ray Tetra together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Black Ghost Knifefish and X Ray Tetra?
73โ82ยฐF โ inside Black Ghost Knifefish's 73โ82ยฐF and X Ray Tetra's 72โ82ยฐF.
Is a Black Ghost Knifefish aggressive toward a X Ray Tetra?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Black Ghost Knifefish and X Ray Tetra
Use the scenario that matches the actual group sizes and temperament you plan to keep.
| Scenario | Tank | When it applies |
|---|---|---|
| Minimum viable | 100 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 150 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 220 gal | Best when keeping larger schools or reducing territorial pressure. |