Easy
Harlequin Gold (Rasbora heteromorpha gold)
23–28°C · pH 6–7.5 · 60L
£5.99
Black Harlequin Rasbora is a peaceful planted-aquarium shoaling fish with the classic wedge marking in a darker strain. Best kept in groups of 8+, with. Live Arrival Guarantee and licensed live-animal courier service.
Adult size is the maximum length this species reaches at full maturity (scientific sources). The livestock you receive will be younger and smaller — pick a size variant above for the actual shipping size. Product-photo provenance and any image-specific limitations are stated on the listing.
Trigonostigma heteromorpha
Black Harlequin Rasbora are a shoaling species — they need 6+ to feel safe and show their full colour.
Black Harlequin Rasbora is a peaceful planted-aquarium shoaling fish with the classic wedge marking in a darker strain. Best kept in groups of 8+, with. Live Arrival Guarantee and licensed live-animal courier service.
Adult size is the maximum length this species reaches at full maturity (scientific sources). The livestock you receive will be younger and smaller — pick a size variant above for the actual shipping size. Product-photo provenance and any image-specific limitations are stated on the listing.
Our conservative starting policy is a mature, filtered aquarium at least 60 cm long and about 60 litres, eight or more fish, and measured water screened against 22-25 °C, pH 5-7 and 5-12 dGH.
Maintain these water conditions for optimal health and vibrant colors
Black Harlequin Rasbora (Trigonostigma heteromorpha) is a darker strain of the classic Harlequin Rasbora, loved for its wedge-shaped marking, calm shoaling behaviour and planted-aquarium presence. It is a peaceful midwater fish for stable community aquariums, especially where plants, subdued cover and a proper group help the shoal settle.
| Listed identity | Trigonostigma heteromorpha Black Harlequin strain |
|---|---|
| Adult size | About 4-5cm |
| Minimum aquarium | 60 litres or larger |
| Water | 22-26°C, pH 5.0-7.0, soft to moderate hardness |
| Diet | Quality flakes, micro pellets and small frozen foods |
| Temperament | Peaceful shoaling fish |
Keep at least eight, with more giving better confidence and tighter shoaling. Gentle filtration, plants and open midwater swimming space suit them well. Avoid boisterous or fin-nipping tank mates that can scatter the group.
Use as a first-time buyer. This live fish is packed for a licensed live-animal courier service and covered by the Tropical Fish Co Live Arrival Guarantee.
23–28°C · pH 6–7.5 · 60L
23–28°C · pH 6–7.5 · 60L
23–28°C · pH 5.5–7.5 · 60L
18–26°C · pH 6.5–8 · 30L
23–27°C · pH 7.4–8.4 · 1000L
20–24°C · pH 7–8 · 45L
24–28°C · pH 5.5–7 · 60L
18–25°C · pH 6–8 · 100L
24–28°C
24–28°C · pH 7.5–8.5 · 500L
22–28°C · pH 7–8.5 · 10L
24–27°C · pH 7.5–9 · 250L
24–28°C · pH 8–9 · 300L
20–25°C · pH 6–7.5 · 80L
24–28°C · pH 5.5–7 · 60L
26–30°C · pH 5.5–7 · 60L
