Fire Eel and Hillstream Loach Compatibility Overview
Fire Eel and Hillstream Loach are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. Their ranges meet only at 75โ75ยฐF, which leaves no margin for a heater drifting or a warm room. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Fire Eel | Hillstream Loach | Verdict |
|---|---|---|---|
| Temperature | 75โ82ยฐF | 68โ75ยฐF | โ ๏ธ 75โ75ยฐF (narrow) |
| pH Range | 6.0โ7.0 | 6.0โ7.5 | โ 6.0โ7.0 |
| Temperament | semi | peaceful | โ ๏ธ Monitor |
| Adult Size | 39.4 in | 2.6 in | โ 15ร difference |
| Min. Group | 1+ | 4+ | 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.
Hillstream Loach โ Sewellia lineolata
Sewellia lineolata, known as the Hillstream Loach, is a fascinating species for aquarists. These fish require a well-oxygenated, clear water environment with plenty of hiding spots. With a lifespan of 7 years, they are a long-term commitment. Their olive green color and slender body shape add a unique aesthetic to the tank.
Frequently Asked Questions
Can Fire Eel live with Hillstream Loach?
Generally not recommended. Fire Eel and Hillstream Loach are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. Their ranges meet only at 75โ75ยฐF, which leaves no margin for a heater drifting or a warm room. Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Fire Eel and Hillstream Loach together?
A minimum of 100 gallons is recommended for keeping Fire Eel and Hillstream Loach together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Fire Eel and Hillstream Loach?
75โ75ยฐF (narrow) โ inside Fire Eel's 75โ82ยฐF and Hillstream Loach's 68โ75ยฐF.
Is a Fire Eel aggressive toward a Hillstream Loach?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Fire Eel and Hillstream Loach
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. |