Can Marbled Hatchetfish and Silver Tiger Perch (American Tigerfish) Live Together?

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

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

In terms of spatial distribution, Marbled Hatchetfish prefers the Top (Surface) zone, whereas Silver Tiger Perch (American Tigerfish) occupies the Middle (Open Water) and Bottom (Substrate) zones. Because they use different levels of the water column, territorial disputes are less likely and the tank will appear more balanced.

Additional behavioural considerations to keep in mind: Aggressive fish may bully and stress shy, slow-moving species.

Worth noting: Marbled Hatchetfish 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.

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: Marbled Hatchetfish needs 1–12 dGH while Silver Tiger Perch (American Tigerfish) requires 15–30 dGH.

To house Marbled Hatchetfish and Silver Tiger Perch (American Tigerfish) 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: Plants - Floating, Leaf Litter/Blackwater, Driftwood (Digestion/Hiding). Meeting these requirements will help both species thrive.

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

Marbled Hatchetfish and Silver Tiger Perch (American Tigerfish) 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.