Rasboras & danios · Trigonostigma
Harlequin rasbora
Trigonostigma heteromorpha · Peat swamp streams, Malay Peninsula and Sumatra
Photo: NasserHalaweh, CC BY-SA 4.0, via Wikimedia Commons
At a glance
Water temperature
22–28 °C 72–82 °F
pH
5–7.5 soft, acidic water
Adult size
4.5 cm 1.8 in
Swims
Mid-water mostly in open water
Keep together
8 or more a shoal feels safe
Current
Calm still or slow water
Food
Eats most foods
Temperament
Peaceful
≈ Every value here is an estimate from typical hobby ranges. We're checking them against sources.
Where it comes from
Home water
Peat swamp streams, Malay Peninsula and Sumatra
Lives in swamp or paddy habitat.
The dot marks where it's collected. Home from iNaturalist native sightings (55). Map: Natural Earth.
Tank mates
Checked against a roomy 300 L planted tank with low flow and plenty of caves. Your own tank may change the answer: try it in Your tanks.
Good together
-
Candy stripe L015
Plecos · 10 cm · bottom -
Zebra L046
Plecos · 8 cm · bottom -
Agassiz's dwarf cichlid
Cichlids · 7.5 cm · bottom -
Amano shrimp
Shrimp & snails · 5 cm · bottom -
Boeseman's rainbowfish
Rainbowfish · 10 cm · mid-water -
Bolivian ram
Cichlids · 8 cm · bottom -
Bronze corydoras
Corydoras · 7 cm · bottom -
Butterfly hillstream loach
Loaches · 8 cm · bottom
Keep apart
-
Will eat the harlequin rasbora
-
Need a different pH and will eat the harlequin rasbora
-
Aggressive and will eat the harlequin rasbora
In the hobby
Where to find it
No store or breeder we know of has it right now.
Run a store? List the fish you usually have. Breed fish? List your fry.
Tanks with this fish
No shared tanks have this fish yet. Share yours from Your tanks.
From keepers
Notes appear here when a keeper shares a tank with this fish and writes about it.
Questions keepers ask
How big does a Harlequin rasbora get?
About 4.5 cm (1.8 in) as an adult.
What temperature does a Harlequin rasbora need?
22–28 °C (72–82 °F).
What pH does a Harlequin rasbora need?
pH 5–7.5.
Does a Harlequin rasbora need to be kept in a group?
Yes. Keep at least 8.
Is the Harlequin rasbora aggressive?
No. It is peaceful with fish that suit the same water.
What does a Harlequin rasbora eat?
It eats most foods: flakes, small pellets and frozen foods.
Where does the Harlequin rasbora come from?
Peat swamp streams, Malay Peninsula and Sumatra.
What fish can live with a Harlequin rasbora?
Good tank mates include Candy stripe (L015), Zebra (L046), Agassiz's dwarf cichlid, Amano shrimp, Boeseman's rainbowfish.
All the numbers
| Temperature min (°C) | 22 | Estimate |
|---|---|---|
| Temperature max (°C) | 28 | Estimate |
| pH min | 5 | Estimate |
| pH max | 7.5 | Estimate |
| Adult size (cm) | 4.5 | Estimate |
| Flow | Low | Estimate |
| Habitat | swamp | Estimate |
| Smallest happy group | 8 | Estimate |
| Temperament | Peaceful | Estimate |
| Diet | Omnivore | Estimate |
| Typical price min (CAD) | 3 | Estimate |
| Typical price max (CAD) | 5 | Estimate |
Some values are estimates from typical hobby ranges and haven't been checked against a source yet.