Can Vieja fenestrata and Whiteseam Fighter Live Together?

Vieja fenestrata is a semi-aggressive species (8/10), while Whiteseam Fighter is generally mild-mannered (3/10). This notable difference means Vieja fenestrata may occasionally assert dominance over Whiteseam Fighter.

Vieja fenestrata and Whiteseam Fighter both frequent the Middle (Open Water) and 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.

Worth noting: Whiteseam Fighter is a known jumper, so a tight-fitting lid is essential.

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 Vieja fenestrata (7–8) and Whiteseam Fighter (4–6.5) do not overlap, making it impossible to satisfy both species simultaneously.

Hardness requirements are incompatible: Vieja fenestrata needs 8–20 dGH while Whiteseam Fighter requires 1–5 dGH.

To house Vieja fenestrata and Whiteseam Fighter together, plan for an aquarium of at least 450 litres with a minimum length of 150 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), Driftwood (Digestion/Hiding), Leaf Litter/Blackwater, Plants - Densely covered, Plants - Floating. Meeting these requirements will help both species thrive.

Note a potential conflict in setup requirements: Vieja fenestrata is a plant destroyer, which conflicts with Whiteseam Fighter's requirement for live plants. Compromise where possible or prioritise the more critical need.

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

Vieja fenestrata and Whiteseam Fighter 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.