Can Regan's Julie and Spotted Rubberlip Pleco (L187a) Live Together?

Regan's Julie is a semi-aggressive species (7/10), while Spotted Rubberlip Pleco (L187a) is generally mild-mannered (3/10). This notable difference means Regan's Julie may occasionally assert dominance over Spotted Rubberlip Pleco (L187a).

Regan's Julie 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.

The safe temperature window for both species falls between 23°C and 24°C. Aim for the midpoint of this range (around 23.5°C) for optimal comfort.

The pH requirements of Regan's Julie (8–9) 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 10–20 dGH. Regular testing will ensure conditions stay within this range.

To house Regan's Julie and Spotted Rubberlip Pleco (L187a) together, plan for an aquarium of at least 110 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: Sand (Sifters), Smooth Gravel (Sensitive Barbels), Established Algae (Otocinclus), Driftwood (Digestion/Hiding). 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.

Regan's Julie 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.