Can Asian Arowana and Green Spotted Puffer (Brackish) Live Together?
Asian Arowana and Green Spotted Puffer (Brackish) are not recommended as tank mates due to incompatible water types. 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 Green Spotted Puffer (Brackish)?
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
Asian Arowana is a semi-aggressive species (8/10), while Green Spotted Puffer (Brackish) is highly aggressive (9/10). This modest difference means Green Spotted Puffer (Brackish) may occasionally assert dominance over Asian Arowana.
Both Asian Arowana and Green Spotted Puffer (Brackish) are highly aggressive, increasing the risk of violent confrontations.
In terms of spatial distribution, Asian Arowana prefers the Top (Surface) zone, whereas Green Spotted Puffer (Brackish) occupies the Middle (Open Water) and Bottom (Substrate) zones. 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: Asian Arowana is a known jumper, so a tight-fitting lid is essential.
Water Parameters
The safe temperature window for both species falls between 26°C and 28°C. Aim for the midpoint of this range (around 27.0°C) for optimal comfort.
Both fish can tolerate a pH between 7.5 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 12–12 dGH. Regular testing will ensure conditions stay within this range.
Crucially, these species require different water types — one needs freshwater while the other requires brackish conditions. This is a hard barrier to keeping them together.
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Tank Setup
To house Asian Arowana and Green Spotted Puffer (Brackish) together, plan for an aquarium of at least 1000 litres with a minimum length of 240 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), Sand (Sifters), Shells (Breeding/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 Green Spotted Puffer (Brackish) live together?
No. This combination is not recommended. Key incompatibilities — such as different water type needs — make cohabitation unsafe.
What size tank do Asian Arowana and Green Spotted Puffer (Brackish) need?
A minimum of 1000 litres (tank length at least 240 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 Green Spotted Puffer (Brackish) together?
Keep the aquarium between 26°C and 28°C. A target of around 27.0°C sits comfortably within both species' preferred ranges.
Are Asian Arowana or Green Spotted Puffer (Brackish) aggressive?
Asian Arowana is semi-aggressive (8/10) and Green Spotted Puffer (Brackish) is highly aggressive (9/10). Their similar temperaments generally lead to a peaceful coexistence.
What pH do Asian Arowana and Green Spotted Puffer (Brackish) need?
Both species overlap in the 7.5–7.5 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.
Will Green Spotted Puffer (Brackish) nip Asian Arowana's fins?
Green Spotted Puffer (Brackish) is a known fin nipper. If Asian Arowana has long or flowing fins, there is a real risk of fin damage. Keeping Green Spotted Puffer (Brackish) in a larger group can help redirect nipping behaviour toward conspecifics.
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.
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