Can Tanganyikan Clown Cichlid (Eretmodus) and Zebra Oto Live Together?

Tanganyikan Clown Cichlid (Eretmodus) is a semi-aggressive species (7/10), while Zebra Oto is peaceful (0/10). This notable difference means Tanganyikan Clown Cichlid (Eretmodus) may occasionally assert dominance over Zebra Oto.

Large aggression gap (7 points) between Tanganyikan Clown Cichlid (Eretmodus) and Zebra Oto increases stress risk for the more peaceful fish.

Tanganyikan Clown Cichlid (Eretmodus) and Zebra Oto both frequent the Bottom (Substrate) region of the setup. This overlap can increase competition for space, so providing ample room and cover is important to keep both species comfortable.

The safe temperature window for both species falls between 24°C and 26°C. Aim for the midpoint of this range (around 25.0°C) for optimal comfort.

The pH requirements of Tanganyikan Clown Cichlid (Eretmodus) (8–9.5) and Zebra Oto (6–7.5) 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 Tanganyikan Clown Cichlid (Eretmodus) and Zebra Oto together, plan for an aquarium of at least 100 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: Smooth Gravel (Sensitive Barbels), Established Algae (Otocinclus), Driftwood (Digestion/Hiding), Plants - Densely covered. 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.

Tanganyikan Clown Cichlid (Eretmodus) and Zebra Oto 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.