Harlequin Rasbora (Trigonostigma heteromorpha) Fish Species Profile
The Harlequin rasbora is a small, peaceful and playful fish.
The species became a favourite among hobbyists after its introduction in the early 1900s.
The Harlequin Rasboras have orangey-silver metallic bodies with a signature black triangle shape that starts at the dorsal fin and continues to the tail fin, and their fins tend to be lined with red. This fish is relatively hardy and can live aside pretty much any tankmates that aren't aggressive, or they become timid and tend to hideaway.
|Scientific Name||Trigonostigma heteromorpha|
|Other Names||Red Rasbora, Harlequin Fish, Red Razor|
|Aquarium Level||Middle - Top|
|Difficulty||Beginner - Intermediate|
|Best kept as||Groups 6+|
|Lifespan||3 - 5 years|
|Maximum Size||up tp 5 cm|
|Temperature||72 - 80 ℉ (22.2 - 26.7 ℃)|
|PH||5.5 - 7|
|GH||2 - 15|
The Harlequin rasbora is native to Malaysia, Singapore Sumatra and southern Thailand. It lives in streams, rivers, and swamp forests, and other watercourses with soft, slow-moving, calm, low acidic and neutral water, low mineral content, and high concentrations of dissolved humic acids.
They prefer high vegetation in their habitat, which provides the much-needed shade that they need.
Harlequin Rasbora is an omnivore, so will eat a wide range of foods but make sure it is relatively small as they only have little mouths.
At feeding time, these fish will become very active and will happily take flakes or pellets from the surface, but you will also need to feed them live or frozen foods such as Daphnia and Bloodworms.