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Harlequin Rasbora
Harlequin Rasbora
Origin
South East Asia
Habitat Size
20-50 Liters
Water Type
Fresh Water
Water Temperature
22º-26ºC
Cost in India
₹50 - ₹100
Size
1 - 2 inches (Nano)
Diet
Omnivore
by Happy Pet TeamUpdated on 2 Dec 2025
Introduction of the Harlequin Rasbora
The Harlequin Rasbora (Trigonostigma heteromorpha) is a vividly colored freshwater aquarium fish, easy to recognize by its lovely copper-orange color and the black triangular spot on its rear half. Southeast Asian native of Thailand, Malaysia, and Singapore, these tiny shoaling fish bring splashes of vibrancy and dynamism to planted aquariums.
Characteristics
Temperament
Aggressive
Friendly
Compatibility with other fishes
Not Friendly
Super Friendly
Habitat Size
Small
Large
Habitat Requirements of the Harlequin Rasbora
Initial Setup Cost
₹3,000 - ₹6,000
Water Temperature
22º -26ºC
Water Type
Fresh Water
PH Level
6 - 7.5
Tank Setup
Essential Equipment
Aquarium tank
Water filter
Heater
Substrate
Light
Nutritional Guide of the Harlequin Rasbora
Avg Monthly Expenses
₹50 - ₹ 100
Harlequin Rasboras are omnivores and like small, easily digestible foods.
Care & Health of the Harlequin Rasbora
Common Health Issues
Fin rot
White spot / ick
Parasites
Fungus
Swim bladder inflammation
Bacterial infections
Signs of good health
Active
Bright coloration
Good apetite
Signs of sickness
Loss of appetite
Swimming abnormally
Dull coloring
Lethargic behaviour
Cloudy eyes
Treat them well, but although hardy and tolerant, Harlequin Rasboras are prone to disease if the living condition deteriorates or becomes stressful.
Prerequisites for a Fish
Adequate tank space
Cleanliness
Effort & commitment
Enriching Environment
Written by
Happy Pet TeamAuthor
Team Happy Pet is a passionate collective of pet experts, enthusiasts, and advocates dedicated to sharing trusted and insightful content.
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Frequently Asked Questions
Are Harlequin Rasboras suitable for beginners?
Yes, Harlequin Rasboras are excellent choices for beginner aquarists due to their hardy nature, peaceful temperament, and ease of care. They can adapt to a wide range of water conditions.
Are Harlequin Rasboras compatible with other fish species?
Yes, Harlequin Rasboras are peaceful fish and get along well with other non-aggressive species. They are suitable additions to community aquariums, especially with other small, peaceful fish that inhabit different areas of the tank.
What should you feed Harlequin Rasboras?
Harlequin Rasboras are omnivores and will accept a variety of foods including flake or pellet food, as well as live or frozen foods such as bloodworms, brine shrimp, and daphnia. Offering a varied diet ensures they receive all the necessary nutrients.