The Black Harlequin Rasbora is a popular aquarium fish. These fish have a black, triangle-shaped patch starting near the dorsal fin, and a mostly purple to black body. The male's patch is slightly rounded at the bottom with an extended tip, while the female's is straight. Females are larger than males.
Species – Black Harlequin Rasbora - Rasbora Heteromorpha
Current Size – 1.5cm – 3cm
Adult Length – 3.5cm – 4.5cm
Temperature Range – 21 - 28°C
pH Range – 5.0 – 7.5
Water Hardness – 18 – 215ppm
Special Requirements - No special requirements, providing you take into account their small stature.
Tanks Mates and Compatibility – This species is very peaceful indeed making it an ideal resident of the well-maintained community tank and an unreserved recommendation for those new to fishkeeping.
As it places no special demands in terms of water chemistry it can be combined with many of the most popular fish in the hobby including other small cyprinids as well as tetras, livebearers, dwarf cichlids, catfishes, and loaches.
Ideal Number to Keep – t’s a schooling species by nature and really should be kept in a group of at least 8-10 specimens.
Maintaining it in decent numbers will not only make the fish less nervous but will result in a more effective, natural-looking display. Males will also display their best colours as they compete with one other for female attention.
Feeding – In the aquarium it will accept dried foods of a suitable size but should not be fed these exclusively. Daily meals of small live and frozen fare such as Daphnia, Artemia and suchlike will result in the best colouration and encourage the fish to come into breeding condition.
Please note – Some images used are library photos and will show the colour potential at a fully mature size, as our fish are juveniles they may vary.
We always aim to supply the fish as close to the purchase size as possible. On rare occasions if this is not possible we will contact you.
The fish are selected at random however you are welcome to make a note on the order and the fish manager will do his best for you, requests are dependent on stock at the time of your order.