Can Leopoldi Stingray (Black Diamond) and Malawi Hawk Live Together?

Leopoldi Stingray (Black Diamond) is a moderately assertive species (5/10), while Malawi Hawk is semi-aggressive (7/10). This modest difference means Malawi Hawk may occasionally assert dominance over Leopoldi Stingray (Black Diamond).

In terms of spatial distribution, Leopoldi Stingray (Black Diamond) prefers the Bottom (Substrate) zone, whereas Malawi Hawk occupies the Middle (Open Water) and Top (Surface) zones. Because they use different levels of the water column, territorial disputes are less likely and the tank will appear more balanced.

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.

The pH requirements of Leopoldi Stingray (Black Diamond) (6–7.5) and Malawi Hawk (7.8–8.6) do not overlap, making it impossible to satisfy both species simultaneously.

For general hardness, the shared comfort zone is 10–10 dGH. Regular testing will ensure conditions stay within this range.

To house Leopoldi Stingray (Black Diamond) and Malawi Hawk together, plan for an aquarium of at least 1135 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: Sand (Sifters), Smooth Gravel (Sensitive Barbels). 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.

Leopoldi Stingray (Black Diamond) and Malawi Hawk 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.