Can Espei Rasbora (Lambchop Rasbora) and Neolamprologus Tretocephalus Live Together?

Espei Rasbora (Lambchop Rasbora) is a peaceful species (1/10), while Neolamprologus Tretocephalus is semi-aggressive (8/10). This notable difference means Neolamprologus Tretocephalus may occasionally assert dominance over Espei Rasbora (Lambchop Rasbora).

Large aggression gap (7 points) between Espei Rasbora (Lambchop Rasbora) and Neolamprologus Tretocephalus increases stress risk for the more peaceful fish.

Espei Rasbora (Lambchop Rasbora) and Neolamprologus Tretocephalus 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.

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 Espei Rasbora (Lambchop Rasbora) (5.5–7.5) and Neolamprologus Tretocephalus (8–9) do not overlap, making it impossible to satisfy both species simultaneously.

For general hardness, the shared comfort zone is 10–12 dGH. Regular testing will ensure conditions stay within this range.

To house Espei Rasbora (Lambchop Rasbora) and Neolamprologus Tretocephalus together, plan for an aquarium of at least 150 litres with a minimum length of 90 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, Leaf Litter/Blackwater, Sand (Sifters), Smooth Gravel (Sensitive Barbels). Meeting these requirements will help both species thrive.

Both species do well with low (still water) water movement, so a standard filtration setup rated for the tank volume should suffice.

Espei Rasbora (Lambchop Rasbora) and Neolamprologus Tretocephalus 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.