Can Pacific Sturgeon and Red Dwarf Rasbora Live Together?

Pacific Sturgeon is a generally mild-mannered species (3/10), while Red Dwarf Rasbora is peaceful (1/10). This modest difference means Pacific Sturgeon may occasionally assert dominance over Red Dwarf Rasbora.

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

There is a critical concern: the Piscivore (Eats small/nano fish) behaviour of one fish directly conflicts with the Nano / Bite-sized (Predation Risk) trait of the other — piscivorous fish will prey on nano-sized tank mates..

Additional behavioural considerations to keep in mind: Hyperactive swimmers can stress shy, slow-moving species through constant motion. Aggressive eaters may outcompete shy fish for food, leading to malnutrition. Shrimp eaters may also prey on very small nano fish.

The safe temperature window for both species falls between 20°C and 22°C. Aim for the midpoint of this range (around 21.0°C) for optimal comfort.

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 Red Dwarf Rasbora 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 - Densely covered. Meeting these requirements will help both species thrive.

Pacific Sturgeon prefers High (River/Stream) flow while Red Dwarf Rasbora needs Low (Still Water) flow. Consider positioning filter outlets and using baffles to create zones of different current intensity within the same tank.

Pacific Sturgeon and Red Dwarf Rasbora 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.

Feeding time deserves special attention with this pairing. Pacific Sturgeon is a known shrimp eater and may prey on small invertebrates or nano fish like Red Dwarf Rasbora. Pacific Sturgeon is an aggressive eater that may prevent Red Dwarf Rasbora from getting enough food.

Because Pacific Sturgeon is a fast, competitive feeder, consider using sinking pellets or feeding at opposite ends of the setup to ensure Red Dwarf Rasbora receives an adequate share.