Can Agassiz Cory and Apistogramma Mouthbrooder (Maulbrüter) Live Together?

Agassiz Cory is a peaceful species (0/10), while Apistogramma Mouthbrooder (Maulbrüter) is moderately assertive (6/10). This notable difference means Apistogramma Mouthbrooder (Maulbrüter) may occasionally assert dominance over Agassiz Cory.

Large aggression gap (6 points) between Agassiz Cory and Apistogramma Mouthbrooder (Maulbrüter) increases stress risk for the more peaceful fish.

Agassiz Cory and Apistogramma Mouthbrooder (Maulbrüter) 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.

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 Agassiz Cory and Apistogramma Mouthbrooder (Maulbrüter) 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.

The safe temperature window for both species falls between 24°C and 27°C. Aim for the midpoint of this range (around 25.5°C) for optimal comfort.

Both fish can tolerate a pH between 6 and 6.8. Maintaining a stable value within this band is more important than hitting an exact number.

For general hardness, the shared comfort zone is 2–8 dGH. Regular testing will ensure conditions stay within this range.

To house Agassiz Cory and Apistogramma Mouthbrooder (Maulbrüter) together, plan for an aquarium of at least 65 litres with a minimum length of 60 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.