Hillstream Loach and Silver Arowana Compatibility Overview
Hillstream Loach and Silver Arowana are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. Hillstream Loach is peaceful and Silver Arowana is aggressive. Expect chasing and fin damage unless the tank is oversized, heavily planted, and watched closely. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Hillstream Loach | Silver Arowana | Verdict |
|---|---|---|---|
| Temperature | 68โ75ยฐF | 68โ86ยฐF | โ 68โ75ยฐF |
| pH Range | 6.0โ7.5 | 5.0โ7.5 | โ 6.0โ7.5 |
| Temperament | peaceful | aggressive | โ Risk |
| Adult Size | 2.6 in | 31.5 in | โ 12ร difference |
| Min. Group | 4+ | 1+ | See below |
| Min. Tank Size | 100 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
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.
โ Full Hillstream Loach care guide
Silver Arowana โ Osteoglossum bicirrhosum
The Silver Arowana is a majestic and unique fish known for its striking appearance and size. It is a large, predatory fish that requires a spacious tank and specific water conditions. While not a community fish, it can be kept with compatible, larger species. They are sensitive to stress and require careful water quality management.
Frequently Asked Questions
Can Hillstream Loach live with Silver Arowana?
Generally not recommended. Hillstream Loach and Silver Arowana are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. Hillstream Loach is peaceful and Silver Arowana is aggressive. Expect chasing and fin damage unless the tank is oversized, heavily planted, and watched closely. Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Hillstream Loach and Silver Arowana together?
A minimum of 100 gallons is recommended for keeping Hillstream Loach and Silver Arowana together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Hillstream Loach and Silver Arowana?
68โ75ยฐF โ inside Hillstream Loach's 68โ75ยฐF and Silver Arowana's 68โ86ยฐF.
Is a Hillstream Loach aggressive toward a Silver Arowana?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Hillstream Loach and Silver Arowana
Use the scenario that matches the actual group sizes and temperament you plan to keep.
| Scenario | Tank | When it applies |
|---|---|---|
| Minimum viable | 250 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 350 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 450 gal | Best when keeping larger schools or reducing territorial pressure. |