Can Golden Wonder Killifish and Rusty Cichlid Live Together?

Golden Wonder Killifish is a moderately assertive species (6/10), while Rusty Cichlid is moderately assertive (5/10). This modest difference means Golden Wonder Killifish may occasionally assert dominance over Rusty Cichlid.

In terms of spatial distribution, Golden Wonder Killifish prefers the Top (Surface) zone, whereas Rusty Cichlid occupies the Middle (Open Water) and Bottom (Substrate) zones. Because they use different levels of the water column, territorial disputes are less likely and the tank will appear more balanced.

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

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 Golden Wonder Killifish (6–7.5) and Rusty Cichlid (7.6–8.6) do not overlap, making it impossible to satisfy both species simultaneously.

For general hardness, the shared comfort zone is 10–20 dGH. Regular testing will ensure conditions stay within this range.

To house Golden Wonder Killifish and Rusty Cichlid together, plan for an aquarium of at least 152 litres with a minimum length of 90 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: Plants - Floating, Sand (Sifters), Established Algae (Otocinclus). 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.

Golden Wonder Killifish and Rusty Cichlid 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.