Can Cobalt Blue Zebra and Congo Puffer (Potato Puffer) Live Together?

Cobalt Blue Zebra is a semi-aggressive species (8/10), while Congo Puffer (Potato Puffer) is highly aggressive (10/10). This modest difference means Congo Puffer (Potato Puffer) may occasionally assert dominance over Cobalt Blue Zebra.

Both Cobalt Blue Zebra and Congo Puffer (Potato Puffer) are highly aggressive, increasing the risk of violent confrontations.

Cobalt Blue Zebra and Congo Puffer (Potato Puffer) 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.

Additional behavioural considerations to keep in mind: Two territorial species may clash over territory, especially in smaller tanks. Two aggressive species housed together increases risk of fighting.

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 Cobalt Blue Zebra (7.8–8.6) and Congo Puffer (Potato Puffer) (6.5–7.5) 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 Cobalt Blue Zebra and Congo Puffer (Potato Puffer) together, plan for an aquarium of at least 200 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: Sand (Sifters). 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.

Cobalt Blue Zebra and Congo Puffer (Potato Puffer) 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.