Can Bulolo Rainbowfish and Duplicareus Corydoras Live Together?

Bulolo Rainbowfish is a peaceful species (2/10), while Duplicareus Corydoras is peaceful (0/10). This modest difference means Bulolo Rainbowfish may occasionally assert dominance over Duplicareus Corydoras.

In terms of spatial distribution, Bulolo Rainbowfish prefers the Middle (Open Water) and Top (Surface) zones, whereas Duplicareus Corydoras 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.

Worth noting: Bulolo Rainbowfish is a known jumper, so a tight-fitting lid is essential.

The safe temperature window for both species falls between 22°C and 26°C. Aim for the midpoint of this range (around 24.0°C) for optimal comfort.

The pH requirements of Bulolo Rainbowfish (7.5–8.8) and Duplicareus Corydoras (6–7.2) do not overlap, making it impossible to satisfy both species simultaneously.

For general hardness, the shared comfort zone is 8–12 dGH. Regular testing will ensure conditions stay within this range.

To house Bulolo Rainbowfish and Duplicareus Corydoras together, plan for an aquarium of at least 200 litres with a minimum length of 120 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 high (river/stream) water movement, so a standard filtration setup rated for the tank volume should suffice.

Bulolo Rainbowfish and Duplicareus Corydoras 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.