Can Red-Bellied Piranha and Tanganyikan Clown Cichlid (Eretmodus) Live Together?

Red-Bellied Piranha is a semi-aggressive species (8/10), while Tanganyikan Clown Cichlid (Eretmodus) is semi-aggressive (7/10). This modest difference means Red-Bellied Piranha may occasionally assert dominance over Tanganyikan Clown Cichlid (Eretmodus).

Both Red-Bellied Piranha and Tanganyikan Clown Cichlid (Eretmodus) are highly aggressive, increasing the risk of violent confrontations.

Red-Bellied Piranha and Tanganyikan Clown Cichlid (Eretmodus) 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 28°C. Aim for the midpoint of this range (around 26.0°C) for optimal comfort.

The pH requirements of Red-Bellied Piranha (6–7.5) and Tanganyikan Clown Cichlid (Eretmodus) (8–9.5) do not overlap, making it impossible to satisfy both species simultaneously.

For general hardness, the shared comfort zone is 10–15 dGH. Regular testing will ensure conditions stay within this range.

To house Red-Bellied Piranha and Tanganyikan Clown Cichlid (Eretmodus) together, plan for an aquarium of at least 384 litres with a minimum length of 120 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: Driftwood (Digestion/Hiding), Plants - Floating, Smooth Gravel (Sensitive Barbels), Established Algae (Otocinclus). 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.

Red-Bellied Piranha and Tanganyikan Clown Cichlid (Eretmodus) 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.