Black Ruby Barb and Fire Eel Compatibility Overview
Black Ruby Barb and Fire Eel 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 Ruby Barb | Fire Eel | Verdict |
|---|---|---|---|
| Temperature | 68โ81ยฐF | 75โ82ยฐF | โ 75โ81ยฐF |
| pH Range | 5.5โ7.5 | 6.0โ7.0 | โ 6.0โ7.0 |
| Temperament | peaceful | semi | โ ๏ธ Monitor |
| Adult Size | 2.2 in | 39.4 in | โ 18ร difference |
| Min. Group | 6+ | 1+ | See below |
| Min. Tank Size | 100 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
Black Ruby Barb โ Pethia nigrofasciata
The Black Ruby Barb is a vibrant, active species suitable for beginners. It requires a spacious tank and a school of its own kind to thrive. Its striking colors and lively nature make it a popular choice.
โ Full Black Ruby Barb care guide
Fire Eel โ Mastacembelus erythrotaenia
The Fire Eel is a stunning, red-bottomed species that requires a spacious tank. They are peaceful bottom feeders and do best in a well-planted, mature aquarium. With a moderate activity level, they can be a great addition to a community tank, but their size and diet may be incompatible with smaller fish.
Frequently Asked Questions
Can Black Ruby Barb live with Fire Eel?
Generally not recommended. Black Ruby Barb and Fire Eel 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 Ruby Barb and Fire Eel together?
A minimum of 100 gallons is recommended for keeping Black Ruby Barb and Fire Eel together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Black Ruby Barb and Fire Eel?
75โ81ยฐF โ inside Black Ruby Barb's 68โ81ยฐF and Fire Eel's 75โ82ยฐF.
Is a Black Ruby Barb aggressive toward a Fire Eel?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Black Ruby Barb and Fire Eel
Use the scenario that matches the actual group sizes and temperament you plan to keep.
| Scenario | Tank | When it applies |
|---|---|---|
| Minimum viable | 114 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 180 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. |