Goldfish and Silver Arowana Compatibility Overview
Short answer: only with care. Goldfish is a cool-water fish and Silver Arowana is tropical. It can work in a large, well-planted tank if you watch both fish closely for the first weeks.
Goldfish and Silver Arowana can potentially coexist, but the combination requires careful attention. Goldfish is a cool-water fish and Silver Arowana is tropical, so the usable temperature range decides this pairing. Their preferred temperature ranges have little safe overlap. A larger tank (minimum 100 gallons), dense planting, and close monitoring are essential.
| Factor | Goldfish | Silver Arowana | Verdict |
|---|---|---|---|
| Temperature | 50–74°F | 68–86°F | ✅ 68–74°F |
| pH Range | 6.5–8.0 | 5.0–7.5 | ✅ 6.5–7.5 |
| Temperament | peaceful | aggressive | ❌ Risk |
| Adult Size | 12 in | 31.5 in | ⚠️ 2.6× difference |
| Min. Group | 1+ | 1+ | See below |
| Min. Tank Size | 100 gallons (for both species) | — | |
Compatibility Positives
Caution Points
Species Profiles
Goldfish — Carassius auratus
Classic pond and aquarium fish that prefer cool water. Heavy waste producers that require robust filtration. Will eat small fish and shrimp.
Silver Arowana — 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 Goldfish live with Silver Arowana?
With significant caution and a larger tank. Goldfish and Silver Arowana can potentially coexist, but the combination requires careful attention. Goldfish is a cool-water fish and Silver Arowana is tropical, so the usable temperature range decides this pairing. Their preferred temperature ranges have little safe overlap. A larger tank (minimum 100 gallons), dense planting, and close monitoring are essential.
What tank size do I need for Goldfish and Silver Arowana together?
A minimum of 100 gallons is recommended for keeping Goldfish and Silver Arowana together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Goldfish and Silver Arowana?
68–74°F — inside Goldfish's 50–74°F and Silver Arowana's 68–86°F.
Is a Goldfish aggressive toward a Silver Arowana?
Goldfish is peaceful and Silver Arowana is aggressive. Expect chasing and fin damage unless the tank is oversized, heavily planted, and watched closely.
Safer Tank Mates for Goldfish and Silver Arowana
The highest-scoring compatible partners for each species in our compatibility data.
For Goldfish
- Weather Loach — 98/100
- Bristlenose Pleco — 87/100
- Denison Barb — 87/100
- Koi — 86/100
- Swordtail — 79/100
Related Compatibility Guides
Tank Size for Goldfish 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. |