Harlequin Rasbora: A Peaceful and Colorful Schooling Fish

The Harlequin Rasbora (Trigonostigma heteromorpha) is a small, vibrant freshwater fish loved by aquarists for its striking appearance and peaceful nature. Known for their signature black triangular patch and shimmering copper-orange body, Harlequin Rasboras bring color, movement, and harmony to any community aquarium.

---

Appearance

Harlequin Rasboras are instantly recognizable by their metallic orange to pinkish bodies and the bold, black triangular marking that extends from the midsection to the tail. Growing up to 2 inches in length, these fish look their best when kept in schools, where their synchronized swimming creates a beautiful, dynamic display.

---

Behavior and Temperament

These rasboras are peaceful, schooling fish that thrive in groups of at least 6–8 or more. They are active but non-aggressive, making them ideal for community aquariums. Their calm nature allows them to coexist perfectly with other small, non-aggressive fish.

---

Tank Requirements

• Tank Size: 10+ gallons for a small group

• Water Temperature: 72–80°F

• pH Range: 6.0–7.5

• Water Hardness: 2–12 dGH

• Aquascape: Planted tanks with soft lighting and open swimming space

Harlequin Rasboras prefer well-planted aquariums with subdued lighting, where they feel safe and show their brightest colors.

---

Diet

These fish are omnivorous and easy to feed. Offer a varied diet for the best health and coloration:

• High-quality flakes or micro-pellets

• Frozen or live foods (daphnia, baby brine shrimp, bloodworms)

• Vegetable-based foods for balance

---

Breeding

Breeding Harlequin Rasboras is possible in a separate tank. They are egg scatterers, often laying their eggs under broad-leaved plants. Slightly acidic water and soft lighting help encourage spawning. Once the eggs are laid, it’s best to remove the parents to prevent them from eating the eggs.

---

Tank Mates

Harlequin Rasboras do well in community aquariums with other peaceful species, such as:

• Neon or cardinal tetras

• Corydoras catfish

• Small gouramis

• Other rasboras and livebearers

• Peaceful dwarf shrimp and snails

Avoid housing them with aggressive or fin-nipping fish.

---

Why Choose Harlequin Rasboras?

• Hardy and beginner-friendly

• Stunning school display with vibrant colors

• Peaceful and community-safe

• Easy to care for and breed

• Adds lively movement to planted tanks

---

The Harlequin Rasbora is a perfect choice for aquarists looking for a colorful, low-maintenance schooling fish that thrives in a peaceful community environment. Their beauty and graceful swimming behavior make them a must-have for any freshwater aquarium.

---