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Harlequin Rasbora

The Harlequin Rasbora, Rasbora heteromorpha, is very stunning nano fish. Reaching a max size of about 1 inch, these fish are a great addition to any community tank. They have an amazing coloration of orange while having a pork chop shaped dark patch toward their tail. 

Please Note: All fish shipments have a 100% Live Arrival Guarantee when shipping with Overnight (1 Day) option. All other options void our Live Arrival Guarantee for fish. 

Like most nano fish, the Harlequin Rasbora does best in groups of 10. They prefer to have open space to switch in the aquarium. In nature they come from soft acidic water. Leaves, driftwood and cones come in handy to reproduce their natural habitat. They are very hardy and accept a wide range of parameters. 

We feed these guys a mix of frozen daphnia, baby brine and cyclops. 

Our Tank Parameters

  • Ph: 7.2 to 7.5
  • Gh: 8 to 16
  • Kh:  4 to 7
  • TDS: 180 to 250
  • Temp: 70 to 74

Tank Recommendations

  • Leaves: Indian Almond or Guava
  • Wood: Malaysian or Mopani
  • Cones: Alder Cones
  • Other: A buffered substrate as they prefer soft acidic water

Customer Reviews

Based on 45 reviews
Cutest fish!

Arrived healthy and happy! Mingled immediately with my other Harlequins! Fast shipping, excellent packing and got a extra fish! A Swedish Fish! :) DEFINITELY would buy from again! Thank you Tyler & Rob! PS: Rob, more videos! :)

Steve DeCicco

Awesome I’ve been trying to find these , they are not red and black, they are orange and black. I bought some a few years ago from absolutely fish in New Jersey. I lost a few over time. So glad I got these .


Bought 15 of these little guys. All came alive and active. Size was a little smaller than I expected but not crazy small. Have had them in my quarantine tank with my Kuhli Loach's for about 2 weeks now. They have already gotten bigger, their color has rocketed back and they are doing great. Zero deaths. Flip Aquatics is awesome and has high quality livestock. Buy with confidence!

Doug Greene

Fish arrived Quickly and in great health… Will buy from this person again

Joan Smith
7+1. All alive and well

Love these beautiful little fish. All arrived alive and are eating well, very active. Thank you for the extra fish. Already thinking about next order.