Can Apistogramma viejita and Malawi Hawk Live Together?

Apistogramma viejita 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 Apistogramma viejita.

In terms of spatial distribution, Apistogramma viejita 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.

Additional behavioural considerations to keep in mind: Aggressive fish may bully and stress shy, slow-moving species. Hyperactive swimmers can stress shy, slow-moving species through constant motion. Two territorial species may clash over territory, especially in smaller tanks.

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 Apistogramma viejita (5–7) and Malawi Hawk (7.8–8.6) do not overlap, making it impossible to satisfy both species simultaneously.

Hardness requirements are incompatible: Apistogramma viejita needs 1–8 dGH while Malawi Hawk requires 10–25 dGH.

To house Apistogramma viejita and Malawi Hawk together, plan for an aquarium of at least 475 litres with a minimum length of 180 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), Leaf Litter/Blackwater, Driftwood (Digestion/Hiding). 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.