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Harlequin Rasbora - Trigonostigma heteromorpha

3 Reviews


The Harlequin Rasbora (Trigonostigma heteromorpha) is a silver to gold metallic fish with a wide black, roughly triangular mark that covers the rear half of the body. Reddish iridescent tones mark the upper "triangle" and flanks, and the fins usually have an orangish tinge.

Many tropical community aquariums are populated with tetras, rasboras and other similar schooling fish. Though these fish are rather small, their pleasant temperaments, the schooling behaviors they exhibit and a vast variety of colors and shapes make them popular in the hobby. They can grow anywhere from a few centimeters to a few inches, and can add movement to a freshwater fish tank. Most of these fish are fairly easy to care for and have similar water chemistry and care requirements.

Tetras are probably the the largest group of fish offered for community aquariums. They can be distinguished from other schooling community fish by the small adipose fin present between the dorsal fin and the tail. Tetras include small species such as the vibrant neon and cardinal tetras to much larger and more robust species like Buenos Aires Tetras and Congo Tetras.

Danios are commonly recommended as "starter fish" and dither fish. They are fast and active swimmers and they like a long tank to swim in. Danios have interesting markings and are generally hardy and peaceful.

Rasboras are actually small members of the carp family. These schooling fish can be very colorful and are popular for community tanks.

These fish prefer aquariums with plenty plants and ornamentation to explore, but also need plenty of open space to swim. They can be fed commercial flakes, granules and small pellets as a staple diet, with occasional feedings of meaty frozen or freeze dried treats such as bloodworms, plankton, mysis or brine shrimp. They prefer to be kept in groups of six or more to school and feel secure.


F90 0022 0486
That Fish Place
Common NameHarlequin Rasbora
Scientific NameTrigonostigma heteromorpha
Max Size (in inches)2
Community SafeYes
pH Range5.0-7.0
Min Tank Size (in gallons)15
Temperature Range74-80
Internal Id

State Restrictions
Armed Forces Americas
Armed Forces Europe
Armed Forces Pacific
Puerto Rico


Ratings & Reviews

3 reviews

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Not compatable with Cobra Guppies.


While they are a great looking schooling fish and get along with most fish, including other guppies ( Fancy and assorted ). They absolutely don't like Cobra guppies and will rip them to shreads.



These fish are wonderful pets and easy to care for. I haven't stopped enjoying them since I got them. Definitely one of my new favorite fish!

Harlequin Rasbora, the best rasbora


Harlequin Rasbora won't rip apart adult guppies. I'm not sure what's going on with the other user review. They may nip if mating, but these are mostly peaceful. Make sure you have them in schools of 8 or more.