Can Arapaima and Cyprichromis Leptosoma Live Together?
Arapaima and Cyprichromis Leptosoma are not recommended as tank mates due to conflicting pH requirements. 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 Arapaima and Cyprichromis Leptosoma?
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.
Behaviour & Temperament
Arapaima is a semi-aggressive species (7/10), while Cyprichromis Leptosoma is generally mild-mannered (3/10). This notable difference means Arapaima may occasionally assert dominance over Cyprichromis Leptosoma.
Arapaima and Cyprichromis Leptosoma both frequent the Top (Surface) and Middle (Open Water) region of the setup. This overlap can increase competition for space, so providing ample room and cover is important to keep both species comfortable.
Worth noting: Arapaima is a known jumper, so a tight-fitting lid is essential.
Water Parameters
The safe temperature window for both species falls between 24°C and 28°C. Aim for the midpoint of this range (around 26.0°C) for optimal comfort.
The pH requirements of Arapaima (6–7.5) and Cyprichromis Leptosoma (8–9) do not overlap, making it impossible to satisfy both species simultaneously.
For general hardness, the shared comfort zone is 8–15 dGH. Regular testing will ensure conditions stay within this range.
Tank Setup
To house Arapaima and Cyprichromis Leptosoma together, plan for an aquarium of at least 15000 litres with a minimum length of 600 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: Sand (Sifters). Meeting these requirements will help both species thrive.
Both species do well with low (still water) water movement, so a standard filtration setup rated for the tank volume should suffice.
Why This Pairing Usually Fails in Practice
Arapaima and Cyprichromis Leptosoma are the kind of pair that can look acceptable in a shop but become a maintenance problem at home. The main risk is not a single number in the chart; it is the way incompatible behavior, water needs, or pressure on space compounds over time once both fish are established in the same tank.
Frequently Asked Questions
Can Arapaima and Cyprichromis Leptosoma live together?
No. This combination is not recommended. Key incompatibilities — such as critical behavioural conflicts — make cohabitation unsafe.
What size tank do Arapaima and Cyprichromis Leptosoma need?
A minimum of 15000 litres (tank length at least 600 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 Arapaima and Cyprichromis Leptosoma together?
Keep the aquarium between 24°C and 28°C. A target of around 26.0°C sits comfortably within both species' preferred ranges.
Are Arapaima or Cyprichromis Leptosoma aggressive?
Arapaima is semi-aggressive (7/10) and Cyprichromis Leptosoma is generally mild-mannered (3/10). The gap in aggression levels means the calmer fish may experience stress from the more assertive one.
What pH do Arapaima and Cyprichromis Leptosoma need?
Their pH requirements do not overlap. Arapaima prefers 6–7.5, while Cyprichromis Leptosoma needs 8–9. This makes them incompatible in the same water chemistry.
Shared setup supplies
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Guidarium Editorial Desk
Reviewed against Guidarium care, stocking, and compatibility standards. Read the editorial policy.
- Last reviewed
- May 4, 2026
- Last updated
- May 4, 2026
- Issues or corrections?
- Contact the editorial team
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