Best Tank Mates for Asian Arowana: Stingrays, Oscars, or Solo?
The Asian Arowana (Scleropages formosus) is often called the “dragon fish” for a reason. Its metallic scales, deliberate movements, and territorial nature make it a magnificent but challenging centerpiece for any large aquarium.
One of the most common questions among arowana keepers – especially those upgrading to a tank in the 1.5m to 2m range – is whether they should keep their arowana solo or introduce tank mates.
In this guide, we evaluate three popular options: stingrays, oscars, and solo keeping, based on compatibility, tank size requirements, filtration needs, and real-world success rates.
✅ Pro tip: Regardless of tank mates, arowanas require a minimum tank width of 68cm and a robust bottom filtration system like the JHW Water-Slasher to handle their high bioload. A 157cm or 177cm tank is strongly recommended for any community setup.
Option 1: Arowana with Stingrays – The Classic Large-Tank Combo
Why Keep Arowana and Stingrays Together?
This is a visually stunning combination. The arowana occupies the top water column, while stingrays glide across the bottom. They rarely compete for space or food, which reduces aggression.
Compatibility Score: ★★★★☆ (4/5)
| Factor | Assessment |
|---|---|
| Aggression risk | Low – they occupy different zones |
| Water parameter match | Good – both prefer warm (26-30°C), clean, slightly acidic to neutral water |
| Feeding conflict | Moderate – stingrays are slow eaters; arowana may steal food |
| Tank size needed | 177cm or larger recommended |
Challenges to Watch For
- Bottom glass strength is critical. Stingrays are heavy-bodied and constantly in contact with the tank floor. A PVB laminated double-layer bottom (e.g., 10mm+10mm) is strongly recommended to prevent long-term stress fractures.
- Filtration must handle high waste. Both species are messy eaters. A sump with backwash sedimentation chamber (like the JHW Water-Slasher system) makes sludge removal much easier.
- Feeding technique matters. Target-feed stingrays with tongs or a feeding stick to ensure they get enough food before the arowana intercepts it.
Verdict for B2B & Serious Hobbyists
✔ Recommended – if you have a 177cm+ tank with a reinforced bottom and high-flow filtration.
✘ Not recommended – for standard 127cm tanks or setups with thin glass bottoms.
Option 2: Arowana with Oscars – Aggressive but Feasible
Why Combine Arowana with Oscars?
Oscars (Astronotus ocellatus) are large, intelligent cichlids with bold personalities. They occupy the mid-to-bottom zone, which overlaps partially with arowana territory but not completely. Some keepers enjoy the “active tank” dynamic.
Compatibility Score: ★★★☆☆ (3/5)
| Factor | Assessment |
|---|---|
| Aggression risk | Moderate to high – both can be territorial |
| Water parameter match | Good – both like warm, clean water |
| Feeding conflict | High – oscars are fast and competitive |
| Tank size needed | 157cm minimum, 177cm preferred |
Challenges to Watch For
- Size mismatch is dangerous. Young oscars may be eaten by a large arowana. Introduce oscars that are already 15cm+ in size.
- Both species are jumpers. A sliding glass cover is essential – not optional.
- Aggression spikes during feeding. Multiple feeding spots and sinking pellets for oscars help reduce direct competition.
Verdict
✔ Possible – for experienced keepers who accept some risk and have a 157cm+ tank with strong biological filtration.
✘ Not ideal – for commercial displays (hotels, offices) where predictable, peaceful behavior is expected. Solo or stingray tanks are safer for public viewing.
Option 3: Solo Arowana – The Simplest and Safest Choice
Why Keep an Arowana Alone?
Many professional breeders and commercial installers (hotels, corporate lobbies) choose to keep arowanas solo. The reasons are practical:
- Zero aggression risk – no fin nipping, no food competition, no stress injuries.
- Lower filtration load – one large fish produces far less waste than a community tank.
- Cleaner visual focus – the arowana becomes the undisputed centerpiece.
Compatibility Score: ★★★★★ (5/5 for simplicity)
| Factor | Assessment |
|---|---|
| Aggression risk | None |
| Maintenance effort | Lowest among all options |
| Tank size flexibility | 127cm or larger works well |
| Commercial suitability | Excellent – safe, predictable, elegant |
When Solo Makes the Most Sense
- Hotel lobbies & reception areas – where guests expect a calm, pristine display.
- Corporate offices – where minimal maintenance is a priority.
- First-time arowana owners – allows you to learn the species’ behavior without complications.
💡 Note: Even a solo arowana benefits from a high-performance bottom filter. The JHW Water-Slasher system with built-in UV sterilizer and fluidized bed keeps water crystal clear with very little daily effort.
Direct Comparison: Stingrays vs. Oscars vs. Solo
| Criteria | Stingrays | Oscars | Solo |
|---|---|---|---|
| Visual impact | ★★★★★ | ★★★☆☆ | ★★★★☆ |
| Ease of maintenance | ★★★☆☆ | ★★☆☆☆ | ★★★★★ |
| Tank size requirement | 177cm+ | 157cm+ | 127cm+ |
| Filtration demand | Very high | High | Moderate |
| Risk of injury/fighting | Low | Moderate | None |
| Best for public/commercial display | Yes (large spaces only) | No | Yes |
| Best for hobbyist home tank | Yes | Yes | Yes |
What Tank Size & Filtration Do You Actually Need?
If you decide to keep an arowana with stingrays:
- Minimum tank: 177cm (L) × 68cm (W) × 70/95cm (H)
- Bottom glass: Double-layer PVB laminated (10mm+10mm) – non-negotiable for safety
- Filtration: Sump with backwash chamber, UV sterilizer, and fluidized bed (e.g., JHW GL-12 Water-Slasher)
If you decide to keep an arowana with oscars:
- Minimum tank: 157cm (L) × 68cm (W)
- Cover: Sliding glass or solid lid with weight
- Filtration: High-turnover sump (at least 4-5x tank volume per hour)
If you keep arowana solo:
- Minimum tank: 127cm (L) × 68cm (W)
- Filtration: Any reliable bottom filter system – though a backwash feature still saves significant cleaning time.
Final Recommendation: Which Should You Choose?
| Your situation | Best choice |
|---|---|
| Hotel / office / commercial display | Solo arowana – safe, clean, elegant |
| Home with large budget & space (177cm+ tank) | Arowana + stingrays – spectacular high-end combo |
| Home with 157cm tank & experienced keeper | Arowana + oscars – active but requires attention |
| First-time arowana owner | Solo – learn the species first, add tank mates later |
Product Recommendation for Arowana Keepers
If you are setting up a tank for arowana – whether solo, with stingrays, or with other large cichlids – the JHW Flying Shark Series GL-12 is specifically engineered for this purpose:
- Aviation aluminum cabinet (corrosion-resistant, ideal for humid environments)
- PVB laminated double-layer bottom (explosion-proof safety for heavy stingrays)
- Water-Slasher bottom filtration with backwash chamber, UV sterilizer, and fluidized bed
- Available sizes: 127cm, 157cm, 177cm, 197cm – all with 68cm width
📌 For B2B inquiries (hotels, offices, aquarium shops), bulk discounts and on-site installation support are available.
FAQ – Quick Answers
Q: Can arowana live with stingrays in a 157cm tank?
A: It is tight. A 177cm or larger tank is strongly recommended for long-term success.
Q: Will arowana eat small stingrays?
A: No – arowana mouths are not designed for bottom-dwelling rays. However, very small stingray pups may be stressed by the arowana’s presence. Introduce rays that are at least 20cm disc width.
Q: Are oscars too aggressive for arowana?
A: Oscars can nip fins if the tank is too small. With sufficient space (157cm+) and hiding spots, they often coexist.
Q: What is the easiest tank mate for arowana?
A: Large, fast, top-dwelling fish like silver dollars or tinfoil barbs are lower-risk than oscars. But among the three options – stingrays are actually the most peaceful in terms of direct aggression.