Can Auratus Cichlid (Mbuna) and Clown Killifish Live Together?

Auratus Cichlid (Mbuna) is a highly aggressive species (9/10), while Clown Killifish is peaceful (2/10). This notable difference means Auratus Cichlid (Mbuna) may occasionally assert dominance over Clown Killifish.

Large aggression gap (7 points) between Auratus Cichlid (Mbuna) and Clown Killifish increases stress risk for the more peaceful fish.

In terms of spatial distribution, Auratus Cichlid (Mbuna) prefers the Middle (Open Water) and Bottom (Substrate) zones, whereas Clown Killifish occupies the Top (Surface) zone. 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.

Worth noting: Clown Killifish is a known jumper, so a tight-fitting lid is essential.

The safe temperature window for both species falls between 23°C and 27°C. Aim for the midpoint of this range (around 25.0°C) for optimal comfort.

The pH requirements of Auratus Cichlid (Mbuna) (7.6–8.6) and Clown Killifish (5–7) do not overlap, making it impossible to satisfy both species simultaneously.

Hardness requirements are incompatible: Auratus Cichlid (Mbuna) needs 10–25 dGH while Clown Killifish requires 1–8 dGH. An aquarium test kit is recommended for monitoring.

To house Auratus Cichlid (Mbuna) and Clown Killifish together, plan for an aquarium of at least 240 litres with a minimum length of 120 cm. This accounts for the larger species' space requirements with an additional 20 % buffer to reduce territorial tension.

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), Established Algae (Otocinclus), Plants - Floating, Plants - Densely covered, Leaf Litter/Blackwater. Meeting these requirements will help both species thrive.

Note a potential conflict in setup requirements: Auratus Cichlid (Mbuna) is a plant destroyer, which conflicts with Clown Killifish's requirement for live plants. Compromise where possible or prioritise the more critical need.

Both species do well with moderate (standard) water movement, so a standard filtration setup rated for the tank volume should suffice.