Can Barlow's Dwarf Cichlid (Apistogramma Maulbrüter) and Least Killifish (Heterandria) Live Together?

Barlow's Dwarf Cichlid (Apistogramma Maulbrüter) is a generally mild-mannered species (4/10), while Least Killifish (Heterandria) is peaceful (1/10). This modest difference means Barlow's Dwarf Cichlid (Apistogramma Maulbrüter) may occasionally assert dominance over Least Killifish (Heterandria).

Barlow's Dwarf Cichlid (Apistogramma Maulbrüter) and Least Killifish (Heterandria) both frequent the Bottom (Substrate) and 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.

Additional behavioural considerations to keep in mind: Shrimp eaters may also prey on very small nano fish.

The safe temperature window for both species falls between 22°C and 27°C. Aim for the midpoint of this range (around 24.5°C) for optimal comfort.

The pH requirements of Barlow's Dwarf Cichlid (Apistogramma Maulbrüter) (4.5–6.5) and Least Killifish (Heterandria) (7–8) do not overlap, making it impossible to satisfy both species simultaneously.

For general hardness, the shared comfort zone is 5–5 dGH. Regular testing will ensure conditions stay within this range.

To house Barlow's Dwarf Cichlid (Apistogramma Maulbrüter) and Least Killifish (Heterandria) together, plan for an aquarium of at least 54 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.

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), Driftwood (Digestion/Hiding), Leaf Litter/Blackwater, Plants - Densely covered, Plants - Floating. 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.

Barlow's Dwarf Cichlid (Apistogramma Maulbrüter) and Least Killifish (Heterandria) 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.

Feeding time deserves special attention with this pairing. Barlow's Dwarf Cichlid (Apistogramma Maulbrüter) is a known shrimp eater and may prey on small invertebrates or nano fish like Least Killifish (Heterandria).