Fire Eel and Harlequin Rasbora Compatibility Overview
Fire Eel and Harlequin Rasbora 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 | Fire Eel | Harlequin Rasbora | Verdict |
|---|---|---|---|
| Temperature | 75โ82ยฐF | 72โ81ยฐF | โ 75โ81ยฐF |
| pH Range | 6.0โ7.0 | 5.5โ7.5 | โ 6.0โ7.0 |
| Temperament | semi | peaceful | โ ๏ธ Monitor |
| Adult Size | 39.4 in | 1.75 in | โ 23ร difference |
| Min. Group | 1+ | 8+ | See below |
| Min. Tank Size | 100 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
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.
Harlequin Rasbora โ Trigonostigma heteromorpha
Active mid-level schooling fish with a distinctive black triangular patch. One of the best all-around community tank fish.
Frequently Asked Questions
Can Fire Eel live with Harlequin Rasbora?
Generally not recommended. Fire Eel and Harlequin Rasbora 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 Fire Eel and Harlequin Rasbora together?
A minimum of 100 gallons is recommended for keeping Fire Eel and Harlequin Rasbora together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Fire Eel and Harlequin Rasbora?
75โ81ยฐF โ inside Fire Eel's 75โ82ยฐF and Harlequin Rasbora's 72โ81ยฐF.
Is a Fire Eel aggressive toward a Harlequin Rasbora?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Fire Eel and Harlequin Rasbora
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. |