Can Silver Tiger Perch (American Tigerfish) and Zebra Oto Live Together?

Silver Tiger Perch (American Tigerfish) is a semi-aggressive species (7/10), while Zebra Oto is peaceful (0/10). This notable difference means Silver Tiger Perch (American Tigerfish) may occasionally assert dominance over Zebra Oto.

Large aggression gap (7 points) between Silver Tiger Perch (American Tigerfish) and Zebra Oto increases stress risk for the more peaceful fish.

Silver Tiger Perch (American Tigerfish) and Zebra Oto both frequent the Middle (Open Water) and Bottom (Substrate) 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.

The safe temperature window for both species falls between 21°C and 26°C. Aim for the midpoint of this range (around 23.5°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 Zebra Oto requires 2–10 dGH.

To house Silver Tiger Perch (American Tigerfish) and Zebra Oto 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), Established Algae (Otocinclus), Plants - Densely covered. 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 Zebra Oto 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.