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Trigonostigma
Trigonostigma includes the popular Harlequin Rasboras, known for their striking triangular markings and peaceful schooling behaviour.
3 species indexed
What is Trigonostigma?
Trigonostigma is a genus of Southeast Asian rasboras that are small, social and ideal for planted community aquariums.
Typical habitat and water envelope
Native to forest streams in Malaysia, Thailand and surrounding regions, these fish inhabit soft, slightly acidic waters with gentle flow.
| Temperature (typical) | 23 to 28 C |
| pH (typical) | 6 to 7.5 |
| Hardness band (typical) | very_soft to soft |
| Flow (typical) | low |
Informational only: compatibility logic remains species-level.
Compare species in Trigonostigma
3 species shown
| Name | Size | Temperament |
|---|---|---|
Glowlight Rasbora Trigonostigma hengeli | 3.0 | peaceful |
 Harlequin rasbora Trigonostigma heteromorpha | 5.0 | peaceful |
 Lambchop Rasbora Trigonostigma espei | 3.0 | peaceful |
| Species | Size (cm) | Temp (C) | pH | Hardness | Flow | Temperament |
|---|---|---|---|---|---|---|
Glowlight Rasbora Trigonostigma hengeli | 3.0 | 22.0 to 27.2 C | 6.0 to 7.5 | very soft to medium | low | peaceful |
Harlequin rasbora Trigonostigma heteromorpha | 5.0 | 22.0 to 26.0 C | 5.0 to 7.2 | very soft to medium | low | peaceful |
Lambchop Rasbora Trigonostigma espei | 3.0 | 23.0 to 28.0 C | 6.0 to 6.5 | very soft to soft | low | peaceful |