Can Penguin Tetra and Red Zebra Cichlid (Cherry Red) Live Together?

Penguin Tetra is a peaceful species (2/10), 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 Penguin Tetra.

Large aggression gap (6 points) between Penguin Tetra and Red Zebra Cichlid (Cherry Red) increases stress risk for the more peaceful fish.

Penguin Tetra and Red Zebra Cichlid (Cherry Red) both frequent the Middle (Open Water) region of the setup. This overlap can increase competition for space, so providing ample room and cover is important to keep both species comfortable.

Worth noting: Penguin Tetra 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 Penguin Tetra (5.5–7.5) 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 Penguin Tetra and Red Zebra Cichlid (Cherry Red) together, plan for an aquarium of at least 269 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: Plants - Densely covered, Plants - Floating, Sand (Sifters), Established Algae (Otocinclus). 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 Penguin Tetra'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.

Penguin Tetra 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.