Can Pacific Sturgeon and Parkinson's Rainbowfish Live Together?

Pacific Sturgeon is a generally mild-mannered species (3/10), while Parkinson's Rainbowfish is peaceful (2/10). This modest difference means Pacific Sturgeon may occasionally assert dominance over Parkinson's Rainbowfish.

In terms of spatial distribution, Pacific Sturgeon prefers the Bottom (Substrate) zone, whereas Parkinson's Rainbowfish occupies the Top (Surface) and Middle (Open Water) zones. Because they use different levels of the water column, territorial disputes are less likely and the tank will appear more balanced.

Worth noting: Parkinson's Rainbowfish is a known jumper, so a tight-fitting lid is essential.

There is no temperature overlap between Pacific Sturgeon (10–22°C) and Parkinson's Rainbowfish (25–30°C). This fundamental mismatch makes long-term cohabitation impractical.

Both fish can tolerate a pH between 7 and 8. Maintaining a stable value within this band is more important than hitting an exact number.

For general hardness, the shared comfort zone is 8–20 dGH. Regular testing will ensure conditions stay within this range.

To house Pacific Sturgeon and Parkinson's Rainbowfish together, plan for an aquarium of at least 20000 litres with a minimum length of 600 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), Plants - lighly covered. Meeting these requirements will help both species thrive.

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

Pacific Sturgeon and Parkinson's Rainbowfish 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.