Can Duplicareus Corydoras and Rummynose Rasbora Live Together?
Duplicareus Corydoras and Rummynose Rasbora 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 Duplicareus Corydoras and Rummynose Rasbora?
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
Duplicareus Corydoras is a peaceful species (0/10), while Rummynose Rasbora is peaceful (2/10). This modest difference means Rummynose Rasbora may occasionally assert dominance over Duplicareus Corydoras.
In terms of spatial distribution, Duplicareus Corydoras prefers the Bottom (Substrate) zone, whereas Rummynose Rasbora occupies the Middle (Open Water) zone. Because they use different levels of the water column, territorial disputes are less likely and the tank will appear more balanced.
Water Parameters
The safe temperature window for both species falls between 22°C and 25°C. Aim for the midpoint of this range (around 23.5°C) for optimal comfort.
The pH requirements of Duplicareus Corydoras (6–7.2) and Rummynose Rasbora (7.3–8.5) do not overlap, making it impossible to satisfy both species simultaneously.
For general hardness, the shared comfort zone is 10–12 dGH. Regular testing will ensure conditions stay within this range.
Tank Setup
To house Duplicareus Corydoras and Rummynose Rasbora together, plan for an aquarium of at least 60 litres with a minimum length of 60 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), Plants - Densely covered. 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.
Why This Pairing Usually Fails in Practice
Duplicareus Corydoras and Rummynose Rasbora 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.
Suitable Tank Sizes
Standard aquarium sizes large enough for both Duplicareus Corydoras and Rummynose Rasbora.
20 Gallon High
20 Gallon Long
29 Gallon Standard
30 Gallon Breeder
36 Gallon Bowfront
40 Gallon Breeder
Show 19 more tank sizes
Frequently Asked Questions
Can Duplicareus Corydoras and Rummynose Rasbora live together?
No. This combination is not recommended. Key incompatibilities — such as critical behavioural conflicts — make cohabitation unsafe.
What size tank do Duplicareus Corydoras and Rummynose Rasbora need?
A minimum of 60 litres (tank length at least 60 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 Duplicareus Corydoras and Rummynose Rasbora together?
Keep the aquarium between 22°C and 25°C. A target of around 23.5°C sits comfortably within both species' preferred ranges.
Are Duplicareus Corydoras or Rummynose Rasbora aggressive?
Duplicareus Corydoras is peaceful (0/10) and Rummynose Rasbora is peaceful (2/10). Their similar temperaments generally lead to a peaceful coexistence.
What pH do Duplicareus Corydoras and Rummynose Rasbora need?
Their pH requirements do not overlap. Duplicareus Corydoras prefers 6–7.2, while Rummynose Rasbora needs 7.3–8.5. This makes them incompatible in the same water chemistry.
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Guidarium Editorial Desk
Reviewed against Guidarium care, stocking, and compatibility standards. Read the editorial policy.
- Last reviewed
- May 11, 2026
- Last updated
- May 11, 2026
- Issues or corrections?
- Contact the editorial team
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