Can Asian Arowana and Wels Catfish (European Catfish) Live Together?
Asian Arowana and Wels Catfish (European Catfish) are not recommended as tank mates due to no temperature overlap. Housing these species together is likely to result in stress, health problems, or direct harm to one or both fish.
At a Glance
Can your tank handle Asian Arowana and Wels Catfish (European Catfish)?
Compatibility is only part of the answer. Test both fish with your real tank size, current stock, and maintenance needs to see if you have enough space and a safe stocking level before you add them.
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Behaviour & Temperament
Both Asian Arowana and Wels Catfish (European Catfish) are semi-aggressive species with an aggression score of 8/10. Their matching temperaments mean neither fish is likely to dominate the other in a shared aquarium.
Both Asian Arowana and Wels Catfish (European Catfish) are highly aggressive, increasing the risk of violent confrontations.
In terms of spatial distribution, Asian Arowana prefers the Top (Surface) zone, whereas Wels Catfish (European Catfish) occupies the Bottom (Substrate) zone. Because they use different levels of the water column, territorial disputes are less likely and the tank will appear more balanced.
Additional behavioural considerations to keep in mind: Two territorial species may clash over territory, especially in smaller tanks.
Worth noting: Wels Catfish (European Catfish) is nocturnal and will be most active after lights-out, naturally reducing daytime encounters. Also, Asian Arowana is a known jumper, so a tight-fitting lid is essential.
Water Parameters
There is no temperature overlap between Asian Arowana (26–30°C) and Wels Catfish (European Catfish) (4–25°C). This fundamental mismatch makes long-term cohabitation impractical.
Both fish can tolerate a pH between 6 and 7.5. Maintaining a stable value within this band is more important than hitting an exact number.
For general hardness, the shared comfort zone is 5–12 dGH. Regular testing will ensure conditions stay within this range.
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Tank Setup
To house Asian Arowana and Wels Catfish (European Catfish) together, plan for an aquarium of at least 10000 litres with a minimum length of 400 cm. This recommendation combines the stricter species minimums with a community-load allowance so the pairing has realistic long-term space and filtration headroom.
Providing a mix of open swimming space and sheltered areas with rocks, driftwood, or plants will keep both species comfortable and allow natural behaviour.
Specific environmental needs for this combination include: Smooth Gravel (Sensitive Barbels), Driftwood (Digestion/Hiding). Meeting these requirements will help both species thrive.
Both species do well with moderate (standard) water movement, so a standard filtration setup rated for the tank volume should suffice.
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Frequently Asked Questions
Can Asian Arowana and Wels Catfish (European Catfish) live together?
No. This combination is not recommended. Key incompatibilities — such as non-overlapping temperature ranges — make cohabitation unsafe.
What size tank do Asian Arowana and Wels Catfish (European Catfish) need?
A minimum of 10000 litres (tank length at least 400 cm) is recommended. This provides enough space for both species to establish their own areas and reduces the likelihood of territorial disputes.
What water temperature is best for Asian Arowana and Wels Catfish (European Catfish) together?
Unfortunately, there is no temperature range that satisfies both species. Asian Arowana requires 26–30°C, while Wels Catfish (European Catfish) needs 4–25°C.
Are Asian Arowana or Wels Catfish (European Catfish) aggressive?
Asian Arowana is semi-aggressive (8/10) and Wels Catfish (European Catfish) is semi-aggressive (8/10). Their similar temperaments generally lead to a peaceful coexistence.
What pH do Asian Arowana and Wels Catfish (European Catfish) need?
Both species overlap in the 6–7.5 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.
How do I manage Asian Arowana's territorial behaviour?
Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives Asian Arowana space to claim a territory without encroaching on the other fish's area. Adding décor that divides the tank into distinct zones works especially well.
Does Wels Catfish (European Catfish) being nocturnal affect compatibility?
Wels Catfish (European Catfish) is most active after lights-out, which naturally reduces daytime encounters with its tank mate. This can actually be beneficial, as both fish get undisturbed time to feed and explore. Just ensure food reaches Wels Catfish (European Catfish) during evening hours.
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