Harlequin Rasbora Care Guide
Trichogaster heteromorpha
Harlequin Rasbora hero image
Use a sharp, accurately identified Harlequin Rasbora photo in a natural freshwater aquarium setting.
Key Takeaways
- Harlequin Rasbora needs at least 10 gallons, with 20 gallons preferred.
- Keep water between 22-28°C and pH 6-7.5.
- Keep a group of at least 6 to reduce stress.
Quick Facts
Difficulty: beginner
Min Tank: 10 gallons
Size: 5 cm
Group: 6+
Temperature: 22-28°C
pH: 6-7.5
Temperament: peaceful
Swimming: middle
Diet: omnivore
Lifespan: 5-8 years
Care Overview
Harlequin rasboras are peaceful schooling fish with a distinctive black triangle marking. They are hardy and easy to care for.
Ideal Tank Setup
Harlequin Rasbora tank setup image
Show the recommended 10+ gallon setup, substrate, hiding spots, and swimming area for Harlequin Rasbora.
A 10+ gallon planted tank with open swimming areas. Keep in groups of 6 or more. They prefer slightly acidic to neutral water.
Diet and Feeding
Omnivores that eat small flake food, micro pellets, and small live or frozen foods. Feed 2 times daily.
Best Tank Mates
- Other rasboras
- Tetras
- Corydoras
- Gouramis
- Shrimp
Fish to Avoid
- Large aggressive fish
- Fin-nipping fish
Common Problems
- Stress from small groups
Common Beginner Mistakes
- Using a tank smaller than 10 gallons, which makes water quality harder to keep stable.
- Ignoring adult size, group size, or temperament when choosing tank mates.
- Changing too much water or filter media at once before checking ammonia and nitrite.
Frequently Asked Questions
How many harlequin rasboras should I keep?
At least 6, but 8-10 is better. They are schooling fish and need company to feel secure.
Related Tools
Sources and Review Process
- Freshwater aquarium husbandry references for water quality, tank size, and stocking guidance.
- Species profiles and compatibility rules maintained in the TankWise data set.
- Aquarium health guidance is educational and should not replace an aquatic veterinarian for severe symptoms.