False Tiger Knifefish

Gymnotus javari

False Tiger Knifefish is a bottom-dwelling fish.

Semi-AggressiveBottom dwellerIntermediate

Save this fish or add it directly to one of your aquariums.

Quick facts

Adult size
≤ 20 cm (≤ 7.9 in)
Aquarium size
250 L or larger
Care level
Intermediate
Temperament
Semi-Aggressive
Swimming zone
Bottom dweller
Temperature
24–28 °C
pH
6–7.5
GH
2–10 dGH
KH
1–6 dKH
Diet
Carnivore
Lifespan
up to 12 years

Care requirements

Care level: Intermediate.

Because it uses the bottom area, leave enough open substrate area instead of crowding that part of the aquarium.

The listed lifespan is up to 12 years.

Aquarium size and space needs

An aquarium of 250 L or larger can be a reasonable starting point, but it should not be read as permission to overstock.

Water parameters

The temperature range for this fish is 24–28 °C, which fits many tropical freshwater aquariums. Choose other fish with overlapping temperature needs.

The pH range for this fish is 6–7.5. That points to slightly acidic to neutral water, but stability is more important than sudden corrections.

The GH range for this fish is 2–10 dGH. That gives some flexibility, but sudden changes are usually more stressful than a stable value that is slightly imperfect.

The KH range is 1–6 dKH. Use it as a general stability reference rather than a reason for aggressive adjustments.

Temperament and compatibility

False Tiger Knifefish needs more careful companion choice because the temperament data suggests space, boundaries, or similar-sized fish may matter.

Because this fish uses the bottom area, compatibility is easier when other fish are not all competing for the same swimming space.

Swimming zone and behavior

This fish uses the bottom area, so leave enough open substrate area for movement and feeding.

Feeding

Use foods that suit a meatier diet and avoid combining it with fish small enough to be treated as food.

Because it feeds near the bottom, make sure food reaches the substrate and is not completely taken by faster fish in the open water.

Before adding this fish

  • Plan for an aquarium of 250 L or larger.
  • Make sure the bottom area has enough open substrate for a group.
  • Choose other fish with overlapping temperature needs.
  • Keep pH stable within the listed range instead of making sudden corrections.
  • Choose other fish carefully around this temperament.
  • Offer a varied diet that matches this species.

Similar fish profiles

Use these profiles to compare fish with similar care level, size, temperature range, or swimming behavior.

FAQ

How large does False Tiger Knifefish get?

False Tiger Knifefish reaches ≤ 20 cm (≤ 7.9 in). Allow for adult swimming space, filtration, and compatible companions.

What aquarium size does False Tiger Knifefish need?

Plan for an aquarium of 250 L or larger. Open substrate matters for this bottom-dwelling fish.

Is False Tiger Knifefish peaceful?

False Tiger Knifefish needs more careful companion choice because the temperament data points toward boundaries, space, or similar-sized fish.

What temperature is suitable for False Tiger Knifefish?

The temperature range for this fish is 24 to 28 °C. Choose other fish with overlapping temperature needs and avoid sudden temperature swings.

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