Purple Harlequin Rasbora (Trigonostigma heteromorpha “Purple”)

The Purple Harlequin Rasbora is a peaceful, colorful schooling fish known for its rich purple-violet body and distinctive dark triangular marking. It is an excellent choice for planted and community aquariums, especially when kept in a group where its natural schooling behavior can be enjoyed.

What We Like About This Fish
Beautiful purple-violet coloration
Peaceful and community-friendly
Active schooling behavior
Excellent for planted aquariums
Easy to care for
Great choice for nano and community setups
Recommended Tank Parameters
Temperature: 22–28°C
pH: 6.0–7.5
Water Hardness: Soft to moderately hard
Minimum Tank Size: 40–60 L
Recommended Group: 6–10+ fish
Substrate: Any; darker substrate helps enhance their colors
Plants: Live plants are highly recommended
Care Guidelines

Diet:
Omnivorous. Feed high-quality micro pellets, flakes, and small frozen or live foods such as brine shrimp, daphnia, and bloodworms.

Social Behavior:
Very peaceful and highly social. Keep them in groups of at least 6, preferably 8–10 or more, for confident and natural schooling behavior.

Origin:
Southeast Asia; the species Trigonostigma heteromorpha is native mainly to Malaysia, Thailand, and nearby regions.

Average Adult Size:
Approximately 4–5 cm (1.5–2 inches).

Average Purchase Size:
Approximately 2–3 cm (0.8–1.2 inches).

Shrimp Safe:
Yes — generally shrimp safe. They usually leave adult shrimp alone, but may eat newly hatched or very small baby shrimp.