Can Molly (Sailfin/Black/Dalmatian) and Raspy River Stingray Live Together?

Molly (Sailfin/Black/Dalmatian) is a generally mild-mannered species (3/10), while Raspy River Stingray is generally mild-mannered (4/10). This modest difference means Raspy River Stingray may occasionally assert dominance over Molly (Sailfin/Black/Dalmatian).

In terms of spatial distribution, Molly (Sailfin/Black/Dalmatian) prefers the Top (Surface) and Middle (Open Water) zones, whereas Raspy River Stingray occupies the Bottom (Substrate) zone. Because they use different levels of the water column, territorial disputes are less likely and the tank will appear more balanced.

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.

Both fish can tolerate a pH between 7.5 and 7.5. Maintaining a stable value within this band is more important than hitting an exact number.

Hardness requirements are incompatible: Molly (Sailfin/Black/Dalmatian) needs 12–30 dGH while Raspy River Stingray requires 2–10 dGH.

To house Molly (Sailfin/Black/Dalmatian) and Raspy River Stingray together, plan for an aquarium of at least 850 litres with a minimum length of 180 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, Established Algae (Otocinclus), Sand (Sifters), Smooth Gravel (Sensitive Barbels). Meeting these requirements will help both species thrive.

Note a potential conflict in setup requirements: Raspy River Stingray is a plant destroyer, which conflicts with Molly (Sailfin/Black/Dalmatian)'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.

Molly (Sailfin/Black/Dalmatian) and Raspy River Stingray 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.