Harlequin Rasbora Care Sheet

Harlequin RasboraTropical Fish Guide
Size1.75 inches or 4.5 cm
Fish HardinessEasy to care for
Water Temperature71.6 - 82.4°F or 22 - 28°C
Water pH5.5 - 7.7 pH
Water Hardness1 - 15 dGH
Peaceful or AggressivePeaceful shoaling fish
Number of same species in tankFour or more, more is better
Community FishYes
SexesMales are smaller and slimmer with a more prominent black triangle shape on them than the larger, paler females
StrataMiddle to top
FoodFlake food, blood worms and brine shrimp
BreedingNot very easy to breed
Breeding temperature78.8 - 82.4°F or 26 - 28°C
Scientific nameTrigonostigma heteromorpha or Rasbora heteromorpha
Lifespan5 years

Ideal Harlequin Rasbora Conditions


This is another species of colorful tropical freshwater fish. Their main body color is orange to gold with a very distinctive black triangle on the rear lower part on each side of the body.

Peaceful, Community

They are fairly active but peaceful fish and ideal for a community aquarium setup. Slow introduction into your aquarium is advisable as they tend to be a bit fragile during transition.


They prefer the middle to top parts of the aquarium.

You can keep four or more of these in a tank but in a shoal they do better and also of makes a better impression. Like most shoaling fish they want a good balance between planted areas for hiding and open areas for swimming.
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