Brown Ghost Knifefish

Apteronotus leptorhynchus

Brown Ghost Knifefish is a bottom-dwelling fish.

Semi-AggressiveBottom dwellerIntermediate – Advanced

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

Quick facts

Adult size
≤ 20 cm (≤ 7.9 in)
Care level
Intermediate – Advanced
Temperament
Semi-Aggressive
Swimming zone
Bottom dweller
Temperature
24–28 °C
pH
6–7
GH
3–10 dGH
Diet
Carnivore
Lifespan
up to 10 years

Care requirements

Care level: Intermediate – Advanced.

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 10 years.

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. That points to acidic to neutral water, but stability is more important than sudden corrections.

The GH range for this fish is 3–10 dGH. That gives some flexibility, but sudden changes are usually more stressful than a stable value that is slightly imperfect.

Temperament and compatibility

Brown Ghost 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

  • 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 Brown Ghost Knifefish get?

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

Is Brown Ghost Knifefish peaceful?

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

What temperature is suitable for Brown Ghost 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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