Rainbow Shark and Silver Arowana Compatibility Overview
Rainbow Shark and Silver Arowana are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. Rainbow Shark is semi 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 | Rainbow Shark | Silver Arowana | Verdict |
|---|---|---|---|
| Temperature | 72โ79ยฐF | 68โ86ยฐF | โ 72โ79ยฐF |
| pH Range | 6.5โ7.5 | 5.0โ7.5 | โ 6.5โ7.5 |
| Temperament | semi | aggressive | โ Risk |
| Adult Size | 6 in | 31.5 in | โ 5ร difference |
| Min. Group | 1+ | 1+ | See below |
| Min. Tank Size | 100 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
Rainbow Shark โ Epalzeorhynchos frenatum
Active bottom dweller that becomes territorial at maturity. One per tank; avoid other shark-like or bottom-dwelling species.
โ Full Rainbow Shark 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 Rainbow Shark live with Silver Arowana?
Generally not recommended. Rainbow Shark and Silver Arowana are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. Rainbow Shark is semi 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 Rainbow Shark and Silver Arowana together?
A minimum of 100 gallons is recommended for keeping Rainbow Shark and Silver Arowana together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Rainbow Shark and Silver Arowana?
72โ79ยฐF โ inside Rainbow Shark's 72โ79ยฐF and Silver Arowana's 68โ86ยฐF.
Is a Rainbow Shark aggressive toward a Silver Arowana?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Rainbow Shark 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. |