Overview
- The Harlequin Rasbora (Trigonostigma heteromorpha) is a classic schooling fish with a copper body and a black triangle on the rear half.
- Native to southern Thailand, Peninsular Malaysia, Singapore, Sumatra and Borneo.
- Grows to about 1.8 in (4.5 cm) standard length.
- Kept in aquariums since the early 1900s and an excellent choice for beginners.
Feeding
- A micropredator of insects, worms and zooplankton in the wild.
- Easy to feed. Offer small live and frozen foods alongside quality dried foods.
Habitat
- A tank with a base of 24 × 12 in (60 × 30 cm).
- Shows the best color in a planted tank with a dark substrate. Cryptocoryne suits it well.
- Water: 70–82°F (21–28°C), pH 5.0–7.5, GH 1–12.
Fish Care
- Hardy and undemanding in a well-maintained tank.
Compatibility
- Very peaceful. Good with small cyprinids, tetras, livebearers, dwarf cichlids, catfish and loaches.
Aquarium Behavior
- Forms tight schools. [UNVERIFIED] Keep at least 8–10.
Breeding
- No parental care.
- Eggs are attached to the underside of broad leaves rather than scattered.
- Fry may appear in mature, densely planted tanks.