03 9354 5843


Harlequin rasbora—it has a beautiful metallic color and it is easy to care for. A large school makes an aquarium vivid and vibrant with movement. The harlequin rasbora is a native of Malaysia, Singapore, Sumatra, and southern Thailand. 

They are schooling fish and prefer some dense planting with some floating plants and open swimming areas. Browse our selection of live fish.


Features of Harlequin Rasbora:

  • Reddish-copper color that is accented by a striking black wedge covering the rear half of the body
  • The distinguishing triangular patch begins near the dorsal fin and comes to a point near the base of the caudal fin
  • The species takes on a diamond-like shape
  • Harlequin Rasbora is a small size fish

The Best Aquarium Size for Harlequin Rasbora:

The minimum tank size for a small group of Harlequin Rasboras is 25L. Thanks to their small size, these fish don’t need a ton of room. We always recommend going with larger aquariums if you have the space in your home and budget. Larger tanks will provide your fish with plenty of room to swim around and get comfortable.

After an Aquarium for your fish? Browse our Aquarium Tank Selection here.

Tank Mate Compatibility:

The harlequin rasbora is a shoaling fish; it should be kept in schools of eight to 10 individuals.  You can keep harlequins with any fish as long it’s not large and predatory. 

Great tank mates for Rasbora include:

 Coburg Aquarium, specialised in different species of live fish.

Feeding :

The fish have tiny mouths that aren’t always capable of getting around common fish foods, so keep things as small as possible. A combination of pellets or flakes, live/frozen food like brine shrimpbloodworms are excellent supplemental foods for your fish.

Check out our Top Rated Natural Fish Foods.


Harlequin Rasbora Fish Tank Setup:

Aquarium Filtration

To mimic the harlequin rasbora’s natural environment, use a good filter that won’t create strong water movements. Standard filtration system will work perfectly for your fish.

Plants for Harlequin Rasbora

Harlequin Rasboras love plants because they offer some protection if they ever feel threatened.

Interested in Live Plants for your aquariums? Click here to see more Fish Live Plant 

Decorations for Rasbora

Harlequin Rasboras are small fish. To mimic their natural environment, rock, cove driftwood can be placed in tanks.

After some nice quality decoration for your fish?  Check our Aquarium Ornaments.


You can use a dark-colored sand substrate or gravel. These fish will not spend much time at the bottom of the tank, so you don’t need to worry about possible injury from the gravel.

A variety of Substrates are available at Coburg Aquarium. 

Additional Information

Other customers have purchased

Fish Keeping Snapshot :

Preferred Water Parameters :

Aquarium Set-up Service:

Our design team enables us to create the tank you desire, install your tank where you wish to and provide a maintenance service to ensure everything runs smoothly. We can create almost any aquarium from the small home aquarium to large commercial aquariums for offices, hotels or restaurants. Coburg Aquarium, Australia's leading aquarium shop.

Please contact us if you need any custom tank services.