Silver Arowana and Threadfin Rainbowfish Compatibility Overview
Silver Arowana and Threadfin Rainbowfish are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. Silver Arowana is aggressive and Threadfin Rainbowfish is peaceful. 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 | Silver Arowana | Threadfin Rainbowfish | Verdict |
|---|---|---|---|
| Temperature | 68โ86ยฐF | 72โ86ยฐF | โ 72โ86ยฐF |
| pH Range | 5.0โ7.5 | 5.0โ8.0 | โ 5.0โ7.5 |
| Temperament | aggressive | peaceful | โ Risk |
| Adult Size | 31.5 in | 1.6 in | โ 20ร difference |
| Min. Group | 1+ | 6+ | See below |
| Min. Tank Size | 100 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
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.
โ Full Silver Arowana care guide
Threadfin Rainbowfish โ Iriatherina werneri
The Threadfin Rainbowfish is a popular choice for freshwater aquariums due to its vibrant colors and peaceful nature. It requires a well-maintained tank with plenty of swimming space and a moderate water flow. These fish are not known to be aggressive and can be kept in community tanks with other peaceful species.
Frequently Asked Questions
Can Silver Arowana live with Threadfin Rainbowfish?
Generally not recommended. Silver Arowana and Threadfin Rainbowfish are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. Silver Arowana is aggressive and Threadfin Rainbowfish is peaceful. 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 Silver Arowana and Threadfin Rainbowfish together?
A minimum of 100 gallons is recommended for keeping Silver Arowana and Threadfin Rainbowfish together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Silver Arowana and Threadfin Rainbowfish?
72โ86ยฐF โ inside Silver Arowana's 68โ86ยฐF and Threadfin Rainbowfish's 72โ86ยฐF.
Is a Silver Arowana aggressive toward a Threadfin Rainbowfish?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Silver Arowana and Threadfin Rainbowfish
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. |