Can Otocinclus and Red Zebra Cichlid (Cherry Red) Live Together?

Otocinclus is a peaceful species (0/10), while Red Zebra Cichlid (Cherry Red) is semi-aggressive (8/10). This notable difference means Red Zebra Cichlid (Cherry Red) may occasionally assert dominance over Otocinclus.

Large aggression gap (8 points) between Otocinclus and Red Zebra Cichlid (Cherry Red) increases stress risk for the more peaceful fish.

Otocinclus and Red Zebra Cichlid (Cherry Red) both frequent the Middle (Open Water) and 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.

Additional behavioural considerations to keep in mind: Aggressive fish may bully and stress shy, slow-moving species.

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 Otocinclus (6–7.5) and Red Zebra Cichlid (Cherry Red) (7.8–8.6) 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 Otocinclus and Red Zebra Cichlid (Cherry Red) together, plan for an aquarium of at least 256 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: Established Algae (Otocinclus), Plants - Densely covered, Smooth Gravel (Sensitive Barbels), Driftwood (Digestion/Hiding), Sand (Sifters). Meeting these requirements will help both species thrive.

Note a potential conflict in setup requirements: Red Zebra Cichlid (Cherry Red) is a plant destroyer, which conflicts with Otocinclus'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.

Otocinclus and Red Zebra Cichlid (Cherry Red) 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.