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Encyclopedia / Oddballs & Predators / Guyana leaffish
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Variations

1 kinds · tap one for a closer look

Guyana leaffish

Polycentrus schomburgkii · Schomburgk's leaf fish, Trinidad leaf fish, Polycentrus

A territorial ambush predator that eats fish under about 4 cm; best alone or as a pair with fish too large to eat.

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5.5 cmBody length, without tail ✓
22–26 °CTemperature ✓
6–7pH ✓
UnknownSmallest tank ?
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✕Not recommended
  • Guyana leaffish eats animals up to about 4 cm. Neon tetra only grows to 2.5 cm.
✕Not recommended
  • Guyana leaffish eats animals up to about 4 cm. Cardinal tetra only grows to 3 cm.
✕Not recommended
  • Guyana leaffish eats animals up to about 4 cm. Black neon tetra only grows to 3.2 cm.
!With conditions
  • Only a narrow pH range suits both: exactly 7.
!With conditions
  • Only a narrow pH range suits both: exactly 7.
✓Compatible
✓Compatible
✓Compatible
✓Compatible
✓Compatible

248 species in our list are a good match.

Facts checked against sources on 16 Oct 2026. ✓ means a source backs it; ? means no reliable source yet. See sources

Care and water

Hardness ✓18–20 dGH
Group size ?Can live alone
Temperament ?Semi-aggressive
Swims at ?Middle
Care level ✓Hard
Diet Carnivore
Lifespan ?Unknown
Size in shops 3–5 cm
Growth Medium

Behavior

A territorial ambush predator that eats fish under about 4 cm; best alone or as a pair with fish too large to eat.

  • cave

Food

Live and frozen foods such as bloodworms, brine shrimp and small fish; accepts frozen mysis.

Tap a food to see what it is.

Male or female

Males are velvety black with turquoise or silver spots and flecks; females are deep brown.

Health

Common problems. Tap one to see the signs. This is a guide, not a diagnosis.

Breeding

Cave spawner · Moderate

Cave spawner; eggs are laid in a cave, often on a leaf, and the male guards them for 3-4 days until the fry swim free. Fry are very cannibalistic if underfed.

Pairing

A pair in a quiet tank with caves.

Setup

80 L planted tank with caves and driftwood.

What starts it

Warm water and live food.

Eggs

Up to 600 eggs in a cave; the male guards them until the fry are free-swimming, about 3-4 days.

Raising the fry

The male guards the nest; fry feed on baby brine shrimp.

Common mistakes
  • Housing with small fish
  • Insufficient hiding places
Full breeding guide, day-by-day plan and simulator →

Where it lives in the wild

Amazon RiverGuiana Shield creeksLoading the map…
Native range (rough area)Centre of the rangePlaces on the World Map
RegionNorth-eastern South America – Guyana, Suriname, Venezuela & Trinidad
HabitatSlow, weedy streams and swamps
Native rangeAbout 800 km across
Open on the World Map

The story of the guyana leaffish

A small leaffish from Trinidad and the coastal rivers of the Guianas, Venezuela and Amapá, often in brackish water. Males turn velvety black with bright spots. It is an ambush predator that seldom accepts prepared foods and needs very clean water.

Johannes Müller and Franz Troschel described this fish in 1849 from collections made in Guyana. It is a small ambush predator kept by enthusiasts for its subtle colours.

First described by Johannes Müller & Franz H. Troschel in 1849. Named for Named after explorer Robert H. Schomburgk.

  • Males turn almost black when breeding.
  • It spawns on the ceiling of small caves.
  • It is the only species in its genus.

Sources

15 facts checked with sources

  • Scientific name

    Older books sometimes use Polycentrus punctatus (Linnaeus 1758); ICZN Opinion 1954 (2000) conserved P. schomburgkii, so punctatus is now a synonym. P. tricolor Gill 1858 (Trinidad) is also a synonym. A second species, P. jundia Coutinho & Wosiacki 2014 from the Rio Negro, exists; check imports from Brazil.

    Eschmeyer's Catalog of Fishes: genus Polycentrus
  • Familycorrected

    Legacy has no family; sourced value recorded.

    Eschmeyer's Catalog of Fishes: genus Polycentrus · FishBase: Polycentrus schomburgkii summary
  • Sizecorrected

    SL (standard length). No Seriously Fish profile exists for this species. Legacy 10 cm is almost double the sourced maximum.

    FishBase: Polycentrus schomburgkii summary · Wikipedia: Polycentrus schomburgkii (cites FishBase and aquarium literature)
  • Temperaturecorrected

    Only FishBase gives a range (aquarium reference 13371). Legacy upper 28 not supported.

    FishBase: Polycentrus schomburgkii summary
  • pHcorrected

    Only FishBase gives a range.

    FishBase: Polycentrus schomburgkii summary
  • Hardnesscorrected

    Legacy has no hardness. FishBase 18-20 dH conflicts with Wikipedia (soft water); the species also lives in brackish water, so hard water may be tolerated. Reviewer should treat this range with caution.

    FishBase: Polycentrus schomburgkii summary · Wikipedia: Polycentrus schomburgkii (cites FishBase and aquarium literature)
  • Smallest tank

    Only Wikipedia gives a size (10 US gal = ~38 L), uncited; not enough to record.

    Wikipedia: Polycentrus schomburgkii (cites FishBase and aquarium literature)
  • Temperament

    Predatory; no source rates aggression.

    Wikipedia: Polycentrus schomburgkii (cites FishBase and aquarium literature)
  • Swimming level

    No source names a swimming level.

    FishBase: Polycentrus schomburgkii summary
  • Care levelcorrected

    Legacy 2 (moderate) and legacy story ("much hardier than the Amazon leaffish") are not supported; only source is Wikipedia, last resort.

    Wikipedia: Polycentrus schomburgkii (cites FishBase and aquarium literature)
  • Where it livescorrected

    Legacy has no range field.

    Eschmeyer's Catalog of Fishes: genus Polycentrus · FishBase: Polycentrus schomburgkii summary
  • Male or female

    Wikipedia only (last resort).

    Wikipedia: Polycentrus schomburgkii (cites FishBase and aquarium literature)
  • Breeding

    Wikipedia only (last resort).

    Wikipedia: Polycentrus schomburgkii (cites FishBase and aquarium literature)
  • Eggs and youngcorrected

    Legacy 100-300 is below the sourced maximum of 600.

    FishBase: Polycentrus schomburgkii summary · Wikipedia: Polycentrus schomburgkii (cites FishBase and aquarium literature)
  • Storycorrected

    Legacy claim that it is "much hardier" and "often easier to wean off live food" is not supported.

    Eschmeyer's Catalog of Fishes: genus Polycentrus · Wikipedia: Polycentrus schomburgkii (cites FishBase and aquarium literature)