Can Silver Tiger Perch (American Tigerfish) and Threadfin Rainbowfish Live Together?

Silver Tiger Perch (American Tigerfish) is a semi-aggressive species (7/10), while Threadfin Rainbowfish is peaceful (1/10). This notable difference means Silver Tiger Perch (American Tigerfish) may occasionally assert dominance over Threadfin Rainbowfish.

Large aggression gap (6 points) between Silver Tiger Perch (American Tigerfish) and Threadfin Rainbowfish increases stress risk for the more peaceful fish.

Silver Tiger Perch (American Tigerfish) and Threadfin Rainbowfish both frequent the Middle (Open Water) region of the setup. This overlap can increase competition for space, so providing ample room and cover is important to keep both species comfortable.

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: Aggressive fish may bully and stress shy, slow-moving species.

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

The safe temperature window for both species falls between 23°C and 28°C. Aim for the midpoint of this range (around 25.5°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: Silver Tiger Perch (American Tigerfish) needs 15–30 dGH while Threadfin Rainbowfish requires 1–12 dGH.

To house Silver Tiger Perch (American Tigerfish) and Threadfin Rainbowfish together, plan for an aquarium of at least 650 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: Driftwood (Digestion/Hiding), Plants - Densely covered, Plants - Floating. 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.

Silver Tiger Perch (American Tigerfish) and Threadfin 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.