Oscar and Silver Arowana Compatibility Overview
Short answer: No. Oscar and Silver Arowana are both aggressive. Keep them in separate tanks, or pick one of the safer tank mates listed below.
Oscar and Silver Arowana are generally not recommended to be housed together. Oscar and Silver Arowana are both aggressive; housing them together invites sustained fighting rather than an occasional squabble. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Oscar | Silver Arowana | Verdict |
|---|---|---|---|
| Temperature | 74โ81ยฐF | 68โ86ยฐF | โ 74โ81ยฐF |
| pH Range | 6.0โ8.0 | 5.0โ7.5 | โ 6.0โ7.5 |
| Temperament | aggressive | aggressive | โ Risk |
| Adult Size | 14 in | 31.5 in | โ ๏ธ 2.2ร difference |
| Min. Group | 1+ | 1+ | See below |
| Min. Tank Size | 100 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
Oscar โ Astronotus ocellatus
Intelligent but aggressive cichlids that will eat any fish small enough to fit in their mouth. Require large tanks (75+ gallons) and robust tank mates.
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 Oscar live with Silver Arowana?
Generally not recommended. Oscar and Silver Arowana are generally not recommended to be housed together. Oscar and Silver Arowana are both aggressive; housing them together invites sustained fighting rather than an occasional squabble. Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Oscar and Silver Arowana together?
A minimum of 100 gallons is recommended for keeping Oscar and Silver Arowana together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Oscar and Silver Arowana?
74โ81ยฐF โ inside Oscar's 74โ81ยฐF and Silver Arowana's 68โ86ยฐF.
Is a Oscar aggressive toward a Silver Arowana?
Oscar and Silver Arowana are both aggressive; housing them together invites sustained fighting rather than an occasional squabble.
Related Compatibility Guides
Tank Size for Oscar 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. |