Harlequin Rasbora – Care, Feeding, Breeding & Details You Need!

Harlequin Rasbora is a small, active, exciting, and friendly fish. Caring for them is not difficult and they perfectly decorate any aquarium and bring a lot of positive emotions.

Many lovers of the aquarium world prefer medium-sized and peaceful fish. Harlequin Rasboras are well suited for those who have a small aquarium at home.

Recently Harlequin Rasbora species has become very popular and can be found in many pet stores. The fish themselves are unpretentious, and it is interesting to watch them since they behave quite actively in the water.

Quick Stats

Scientific Name: Trigonostigma heteromorpha
Common Name: Harlequinn Rasbora
Care Level: Easy
Temperament: Peaceful/Timid
Diet: Omnivorous
Temperature: 75–81 °F (24–27 °C)
pH: around 6.4–7.0
Color Form: Silver Body with a Black Patch and Orange Fins
Lifespan: 5-8 Years
Size: Up to 2 inches
Family: Cyprinidae
Minimum Tank Size: 10 Gallons
Tank Set-Up: Freshwater with Plants and Open Swimming Space
Compatibility: Peaceful Community Aquarium

Appearance & Habitat

Harlequin Rasbora has a bright appearance, but to make them feel good in the aquarium, it is best to buy several at once, since in nature, they swim in schools.

The homeland of these fish is in Southeast Asia. They live in rivers, streams, and small reservoirs that are located in the jungle.

There are more than fifty types of Rasboras, but the most common of them is Harlequin Rasbora because it has an attractive color and small size. On average, this underwater inhabitant grows up to 4 cm. It is also called wedge-spotted tetra.

This species got its name because of the black spot on the tail, which resembles a wedge in shape. The fish itself has a copper color.

The male has an acute-angled and long spot. Dorsal and caudal fins are reddish. Female lives from three to four years; the duration of her life depends on the living conditions.

Harlequin Rasbora Care and Maintenance

Rasboras are unpretentious fish; they quickly adapt to new conditions. At the same time, they can be kept in small aquariums with a volume of at least 40 liters. There should be a shelter in the aquarium, as these little inhabitants love to hide.

You can keep a broken clay jug, driftwood or plants as a shelter for them. If the aquarium is small, then you should not plant too many plants, as the fish should have enough space for free swimming.

Comfortable water temperature for them is +25 ° C. Water inhabitants like diffused light. Therefore direct sunlight shouldn’t enter the aquarium. To do this, you can put on different kinds of water floating plants.

Harlequin Rasbora Tank Mates

Harlequin Rasbora gets along well with all peaceful fish.

The following tank mates are suitable for Harlequin Rasboras:

But it is not advised to settle them with cichlids or goldfish or Angelfish since these species will perceive it exclusively as food.

It is important to remember that these fish are quite active and can jump out of the water, so they should only be kept in a closed aquarium.

To maintain cleanliness in water, A good aquarium filter should be installed, but the filter shouldn’t be very powerful. Do not forget about replacing water as it is advised to do this at least once in a week.

Harlequin Rasbora Feeding

Rasboras are not picky about food, so any kind of food is suitable for them, but their diet should be varied. In nature, this species feeds on insects, larvae, and worms, so that the inhabitants of the aquarium are also happy to eat live food.

Rasbora can also be given dry and frozen food. The feed should be poured into the aquarium in small portions so that the fish have time to eat it until it settles to the bottom. Frozen food helps in improving their color and they become more active.

You can feed the fish with plant foods, namely:

  • white bread;
  • dandelions;
  • scalded lettuce;

You need to give ready-made feed in small pieces as the mouth of the Rasbora is small and they cant swallow large particles.

Once a week, You can feed them with bloodworms, as well as grated cheese or low-fat cottage cheese.

Harlequin Rasbora Breeding

Taking care of rasboras is quite simple, but it is challenging to breed this species at home. First of all, you should prepare a spawning aquarium. The water in it should be very soft, with a temperature not lower than +28 ° C.

In the aquarium, there should be plants with broad leaves so that the rasboras can do their mating games over there,

Place one female and two males in it. If the volumes allow, then a small flock is placed in it, but at the same time, there should be more males than females.

The female usually lays eggs on the inside of the leaf, and the male fertilizes it. The whole process lasts no more than two hours. After this, the fish need to be placed back in a common aquarium, as they can eat their fry.

There are also situations when the fish do not spawn. In this case, males and females should be separated for several days, and they should be given live food. Weather conditions have a significant influence on spawning; usually, fish do not start mating in inclement weather and at low atmospheric pressure.

The newborn fry can be fed with infusoria, egg yolk, or some other small feed for their faster growth. After two weeks, they need to be transplanted from the spawn tank to a larger tank, and after a month, they are already able to survive in a common aquarium.

Diseases and their Treatment

Harlequin rasboras are not demanding in care, but if you do not follow the simple rules of its maintenance, then it can become sick. The water temperature mustn’t be lower than +25 ° C. If this aquatic inhabitant stays in cold water for a long time below +20 ° C, then fungal diseases can affect him.

It is not difficult to fix this situation if you recognize the disease before your fish dies. First of all, immediately increase the temperature of the water in the aquarium to +28 ° C and be sure to set the aeration. Within a week, a sick fish should be lowered into a weak solution of potassium permanganate for 10 minutes.

For analysis, a sharp change in the chemical composition of water may be detrimental; therefore, when replacing water in the aquarium, it must be checked for softness. For the prevention of various diseases, salt can be added to the aquarium. For ten liters, you should take one tablespoon of salt.

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