Can Betta Macrostoma and Spotted Rubberlip Pleco (L187a) Live Together?

Betta Macrostoma is a moderately assertive species (6/10), while Spotted Rubberlip Pleco (L187a) is generally mild-mannered (3/10). This modest difference means Betta Macrostoma may occasionally assert dominance over Spotted Rubberlip Pleco (L187a).

Betta Macrostoma and Spotted Rubberlip Pleco (L187a) 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.

Worth noting: Spotted Rubberlip Pleco (L187a) is nocturnal and will be most active after lights-out, naturally reducing daytime encounters. Also, Betta Macrostoma is a known jumper, so a tight-fitting lid is essential.

The safe temperature window for both species falls between 20°C and 24°C. Aim for the midpoint of this range (around 22.0°C) for optimal comfort.

The pH requirements of Betta Macrostoma (4–6) and Spotted Rubberlip Pleco (L187a) (6.5–7.8) 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 Betta Macrostoma and Spotted Rubberlip Pleco (L187a) together, plan for an aquarium of at least 80 litres with a minimum length of 75 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: Leaf Litter/Blackwater, Driftwood (Digestion/Hiding), Plants - Floating, Smooth Gravel (Sensitive Barbels), Established Algae (Otocinclus). Meeting these requirements will help both species thrive.

Betta Macrostoma prefers Low (Still Water) flow while Spotted Rubberlip Pleco (L187a) needs High (River/Stream) flow. Consider positioning filter outlets and using baffles to create zones of different current intensity within the same tank.

Betta Macrostoma and Spotted Rubberlip Pleco (L187a) 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.