Harlequin Rasbora Care Sheet
BeginnerTrigonostigma heteromorpha · fish
Harlequin Rasboras are small, peaceful schooling fish ideal for planted community tanks. They are hardy and beginner-friendly, thriving in groups of 6 or more.
Quick care stats
Adult size2-2.5 inches
Lifespan5-8 years
Min tank size10 gallons
Water temp74-80°F
pH6.0-7.5
Hardness2-15 dGH
Temperamentpeaceful
Group / schooling6+
Tank matesOther peaceful community fish such as tetras, rasboras, corydoras, and dwarf gouramis.
DietOmnivorous; feed quality flake food or micro pellets daily, supplemented with brine shrimp or daphnia 2-3 times per week.
What you need (full setup)
🔧 Tank (10 gallons or larger)Provides adequate swimming space for a school.🔧 Sponge or hang-on-back filterGentle filtration suits their peaceful nature and maintains water quality.🔧 Adjustable heaterMaintains stable tropical temperature around 78°F.🔧 ThermometerMonitors water temperature to prevent fluctuations.🔧 Fine gravel or sand substrateSuitable for planted tanks and mimics natural habitat.🔧 Water conditionerRemoves chlorine and chloramines from tap water.🔧 API Freshwater Master Test KitMonitors pH, ammonia, nitrite, and nitrate levels for water quality.🔧 Live plants and driftwoodProvides cover and replicates their natural Southeast Asian biotope.
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Common health issues
- Ich (white spot disease) from stress or poor water quality
- Fin rot from poor water conditions
- Stress from being kept in too small a group
⚠️ For any sign of illness (not eating, lethargy, swelling, retained shed), see a qualified exotics vet. Care sheets are general guidance only.