Harlequin Rasbora
Trigonostigma heteromorpha
Family: Cyprinidae • Origin: Southeast Asia
The Harlequin Rasbora is a classic community fish with a distinctive triangular black patch on copper-orange body. Hardy and peaceful.
Min Tank
10 gal
Max Size
2"
Temperature
72-81°F
pH
6-7.5
Lifespan
6 years
School Size
6+
Swim Level
middle
Hardness
2-12 dGH
peacefulbeginneromnivoreschooling
Care Tips
- • Keep in groups of 6-10
- • Adaptable to range of conditions
- • Prefers planted tanks
- • Long-lived (5-6 years)
- • Great dither fish
Feeding: Flakes, micro pellets, frozen brine shrimp.
Compatibility Notes: One of the most peaceful schooling fish. Safe with virtually any community fish.
Tank Setup & Water Parameters
Tank Requirements
- Minimum Tank Size
- 10 gallons
- Recommended Tank Size
- 20 gallons
- Swimming Level
- middle
- Minimum School Size
- 6+ fish
Water Parameters
- Temperature
- 72–81°F
- pH Range
- 6–7.5
- Hardness (dGH)
- 2–12
- Water Type
- freshwater
Behavior & Temperament
- Temperament
- peaceful
- Aggression Level
- 1/5
- Schooling
- Yes
- Territorial
- No
- Fin Nipper
- No
- Predatory
- No
- Diet Type
- omnivore
- Growth Rate
- moderate
One of the most peaceful schooling fish. Safe with virtually any community fish.
Breeding
- Breeding Type
- egg layer
- Breeding Difficulty
- difficult
- Lifespan
- 6 years
Ideal For
10 galloncommunitybeginnersplanted tank
Compatible Tank Mates
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Neon Tetra
Paracheirodon innesi
70-81°FpH 6-710+ gal
peacefulschooling 6+1.5"
Cardinal Tetra
Paracheirodon axelrodi
73-81°FpH 4.5-6.510+ gal
peacefulschooling 6+2"
Ember Tetra
Hyphessobrycon amandae
73-84°FpH 5.5-75+ gal
peacefulschooling 8+0.8"
Rummy Nose Tetra
Hemigrammus rhodostomus
75-84°FpH 5.5-720+ gal
peacefulschooling 6+2.5"
Black Neon Tetra
Hyphessobrycon herbertaxelrodi
73-81°FpH 5.5-7.510+ gal
peacefulschooling 6+1.6"
Serpae Tetra
Hyphessobrycon eques
72-82°FpH 6-7.520+ gal
semi-aggressiveschooling 6+1.75"
Similar Species
Black Skirt Tetra
Gymnocorymbus ternetzi
70-82°FpH 6-7.515+ gal
peacefulschooling 5+3"
Platy
Xiphophorus maculatus
70-80°FpH 7-810+ gal
peacefulschooling 3+3"
Molly
Poecilia sphenops
72-82°FpH 7-8.520+ gal
peacefulschooling 3+4.5"
Chili Rasbora
Boraras brigittae
72-82°FpH 5-75+ gal
peacefulschooling 10+0.8"