Can Congo Puffer (Potato Puffer) and Mexican Dwarf Crayfish (CPO) Live Together?

Congo Puffer (Potato Puffer) is a highly aggressive species (10/10), while Mexican Dwarf Crayfish (CPO) is generally mild-mannered (4/10). This notable difference means Congo Puffer (Potato Puffer) may occasionally assert dominance over Mexican Dwarf Crayfish (CPO).

Large aggression gap (6 points) between Congo Puffer (Potato Puffer) and Mexican Dwarf Crayfish (CPO) increases stress risk for the more peaceful fish.

Congo Puffer (Potato Puffer) and Mexican Dwarf Crayfish (CPO) 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.

To improve the chances of a peaceful coexistence in this community tank: Provide a significantly larger tank (at least 50% more volume than the minimum) to allow both Congo Puffer (Potato Puffer) and Mexican Dwarf Crayfish (CPO) to establish separate territories. Add plenty of line-of-sight breaks using driftwood, rocks, and dense planting to reduce territorial confrontations. A larger aquarium with ample hiding spots can help diffuse aggression and give the less dominant fish space to retreat. Keep fin nippers in larger groups to distribute nipping behaviour among conspecifics rather than tank mates.

The safe temperature window for both species falls between 24°C and 25°C. Aim for the midpoint of this range (around 24.5°C) for optimal comfort.

Both fish can tolerate a pH between 6.5 and 7.5. Maintaining a stable value within this band is more important than hitting an exact number.

For general hardness, the shared comfort zone is 6–15 dGH. Regular testing will ensure conditions stay within this range.

To house Congo Puffer (Potato Puffer) and Mexican Dwarf Crayfish (CPO) together, plan for an aquarium of at least 110 litres with a minimum length of 80 cm. This recommendation combines the stricter species minimums with a community-load allowance so the pairing has realistic long-term space and filtration headroom.

Because this pairing requires extra vigilance, include plenty of hiding spots — caves, driftwood, and dense plant clusters — so the less dominant fish can retreat when needed.

Specific environmental needs for this combination include: Sand (Sifters), Driftwood (Digestion/Hiding), Leaf Litter/Blackwater. 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.

This pairing usually fails when the tank is treated like a standard mixed community and the caution flags are ignored. Congo Puffer (Potato Puffer) and Mexican Dwarf Crayfish (CPO) need extra room, more cover, and closer observation during the first few weeks so small aggression, feeding, or territory issues do not snowball into a long-term problem.