They're never aggressive with other fish. The Harlequin rasbora is a hard species to breed. Scientific Name: Trigonostigma heteromorpha Common Name: Harlequinn The ideal water temperature for bettas is 78.0 Fahrenheit, and rasboras like a range of 73.0 to 82.0 Fahrenheit, so both parties are compatible. They should be housed in an aquarium with plenty of broad leafed plants with a stable water temperature between 76 and 79 degrees F, along with an acidic soft water with a pH of 6.0 to 6.3. Rasboras are known for being hardy and beautiful. Place of Origin: Rivers and streams of Thailand, Eastern Sumatra and the Malaysian Peninsula. The Harlequin Rasbora is loved by many aquarium hobbyists. It requires very soft acidic water. The rasbora fish group consists of 84 schooling freshwater fish in the family Cyprinidae. Water Conditions for Harlequin Rasboras and Bettas. They shimmer in the light, giving that cosmic look the fish is known for. You may need to invest in a thermometer and heater if you reside in an area with a cold climate 73 to 82 F (23 to 28 C) The harlequin rasbora is a native of Malaysia, Singapore, Sumatra, and southern Thailand. Rasboras are easy to care for, making them an appealing choice for aquarists of any skill level. Harlequin Rasbora Tetra $ 4.99 $ 4.25 Add to cart. They prefer well-planted aquariums with soft, slightly acidic water. Danios and Rasbora are, generally, excellent community fish. They need to be kept healthy and the conditions in the tank need to match what they'd be used to in the wild. Scientific Name: Rasbora heteromorpha Common Name: Harlequin Rasbora Adult Size: 2 inches Life Expectancy: 5-6 years Habitat: Southeast Asia on the Malay Peninsula throughout western Malaysia and southern Thailand as well as Singapore Minimum Tank Size: 10 gallon Ideal Tank Conditions: Temperature Range: 72-77 F pH Range: 6.0 - 6.5 The Harlequin Rasbora is a schooling fish that can only thrive in groups of at least 6-8 specimens. Harlequin Rasbora (Trigonostigma Heteromorpha) Also, slightly increasing the water temperature will encourage more rapid plant growth. It is easy to set a tank and make a perfect habitat for these two kinds because they are a great match. When we use the term tropical we are usually talking of temperatures around 75 Fahrenheit. Harlequin rasbora ( Trigonostigma Heteromorpha) are freshwater fish from tropical habitats like rivers, swamp forests, and streams. There are many variables involved here but water chemistry, tank water temperature, and pH value stay the same throughout all of these habitats. Harlequin ~ 2.5-3cm. 1.14 - 1.25 . Especially in larger groups an attractive spectacle! The Harlequin Rasbora is loved by many aquarium hobbyists. For this reason, they enjoy warmer water temperatures. You should set up a separate breeding tank with extremely soft, shallow water; peat filtration is recommended. Temperature: 70-82F; pH: 5-7.5; Diet: Omnivore; School size: 8+ No list of schooling fish would be complete without mentioning the awesome harlequin rasbora! Harlequin rasbora prefers to be with their own species again, and will also thrive in a community tank with other small fish. A pH between 6.0 - 7.5, low to moderately hard water between 0 - 12 dH and a temperature range of 72 Fahrenheit (22.2 Celsius) and 81 Fahrenheit (27 Celsius) are optimal water conditions for the Purple Harlequin Rasbora. They live in a variety of streams, rivers, and swamp forests that are similar to the blackwater rivers of South America. They need a temperature range between 23.5C to 28C. Most Rasboras are very peaceful and only require a pH between 6.8 and 7.8. The pH-value can be kept around 6.0 and the temperature should be at 28C (82.4F). The body color changes depending on various factors like population, temperature, dH level etc. Ideal temperature for them is 76-80 degrees, with 82 degrees best for spawning. Habitat and Tank requirements. Additional information. A group of 6 or more dwarf emerald rasboras would be great in a species-only nano tank, but they can also be kept with other peaceful fish of a similar size. The harlequin rasbora at a glance: Fish size 4 to 5 cm Tank size From 54 l Temperature 22C 26C pH level 5.0 7.0 Compatible with Labyrinth fish, loaches, other danios Tank region Middle Food Eats all smaller food types, particularly likes black bloodworms The harlequin rasbora belongs to the carp family (cyprinidae), [] The harlequin rasbora (Trigonostigma heteromorpha) is a tropical fish from the Cyprinidae family. Also known as the Celestial Pearl Danio, the Galaxy Rasboras truly lives up to its name. They are excellent nano tank fish. Twitter; Facebook; Signup Now. 100 gal planted, 18 harlequin rasboras, 5 clown loaches, 3 pearl gouramis, 2 honey dwarf gouramis, 11 cherry barbs, 1 otocinclus, 1 Niger otocinclus, 2 borneo suckers, 2 neon rosey barbs, lots of red shrimp, 3 bala sharks. Water temperature: 72F to 80F (74F should be your target) pH levels: 6.0 to 7.8 (6.5 is best) Water hardness: 2 to 15 KH (the lower the better) Fish Size: M. Qty: 100pcs. The pH-value can be kept around 6.0 and the temperature should be at 28C (82.4F). Temperature; 72 - 80 How to breed the Harlequin Rasbora. Their natural habitat consists of shallow streams flowing through peat swamps with higher concentrations of humic acids. Rasboras prefer a temperature of about 70-82 F. To maintain the temperature of such a high range, a heater must be installed and used throughout the day. Temperature. Temperature: 72 F 80 F. Size: Up to 1.5 Inches. Harlequins are perfect for beginners starting a community aquarium. They nip at one another slightly every once in a while, not very often at all. Like all rasboras and danios, this fish is completely peaceful and totally safe to keep with other fish (as long as the other fish are peaceful as well), snails, shrimp, and live plants. Its easy to see why so many hobbyists treasure this very peaceful fish. (50 ppm to 140 ppm), and temperature between 75 and 80 F. If the aquarium is kept in rooms below 75, use an Aqueon Aquarium Heater to maintain the correct temperature. Harlequin Rasbora native habitat, distribution, behavior & aquarium compatibility. The temperature range of the harlequin rasbora is usually cited as 22 C to 27 C (72 F to 81 F) (for example, Walker, 1971, p. 101) but the fish is capable of living in temperatures from 21 C to 28 C, and indeed usually breeds at around 28 C (82.4 F). Harlequin Rasbora. Freshwater Fish Regarding tank size, at least a 10-gallon tank is necessary. Plan on installing a heater to keep the temperature consistent. They prefer living in warm waters provided by a quality aquarium heater. Temperature: 72 F 80 F. Size: Up to 1.5 Inches. It is imperative that you adhere to the water values preferred by the harlequin rasbora: the harlequin rasbora needs a water temperature between 22 and 28 degrees Celsius and a water hardness of two to 15 degrees German hardness with a pH value of five to seven. They are hardy and prefer to live in a shoal, which can make for an stunning display. We offer a wide variety of rasboras here at Aprils Aquarium! Scientific Name: Rasbora heteromorpha Common Name: Harlequin Rasbora Adult Size: 2 inches Life Expectancy: 5-6 years Habitat: Southeast Asia on the Malay Peninsula throughout western Malaysia and southern Thailand as well as Singapore Minimum Tank Size: 10 gallon Ideal Tank Conditions: Temperature Range: 72-77 F pH Range: 6.0 - 6.5 Freshwater Fish You need to transfer the breedable Harlequins to a separate tank and create the perfect breeding conditions. In 1935, an image of a trio of harlequin rasboras, stamped in 14k gold, would grace the cover of the first edition of William
These small shoaling fish are easy to care for and can be looked after by people of varying experience levels. The harlequin rasbora is a schooling fish and will be happy with six or more of its own kind! You really have plenty of The temperature should be 71 to 80 degrees Fahrenheit. A small group Since we dont advocate that you keep one solo and they enjoy a group, you should ideally aim for 20 30 for extra space as these are not nano-fish. Temperature: Tropical fish do best with temperatures in the high 70s, but there are some cold-water species that prefer cooler temps. The base color of the fish is a deep blue, which mimics the night sky. The specific name ''heteromorpha'', translating from the Greek as "differently shaped", alludes to the fact that the body shape of this species differs from that of other members of the genus ''Rasbora'', and as a Like other tropical fish, Boraras brigittae can live in range of temperatures. Popular species such as the Lambchop Rasbora, Harlequin Rasbora, Lampeye Rasbora, Brilliant Rasbora and the Scissortail Rasbora usually do not grow much bigger than 5 cm. Temperature: 7178F (21.625.5C) pH: 6.57.5: Hardness: 15 dGH: Care level: Moderate: Breeding: Egglayer: Harlequin Rasbora Care Guide & Species Profile June 28, 2022 Robert. The action is continued for about two hours and during this period somewhere between 30 and 80 eggs should be laid on the leaves of the plants. Scientific Name: Rasbora heteromorpha. "The forth species is Corydoras paleatus (Jenyns, 1842) originating from the Rio Paran, north west of Buenos Aires in Argentina. The Greek translation of Heteromorpha literally means differently shaped. This also seems to be a temperature they do well at during all seasons of the year. We recommended presetting the heater to 25C to avoid any major fluctuations in temperature. Harlequin Rasbora Tetra pH: 6 7. The wedge-shaped black patch on the body creates a fantastic visual contrast. The Swarm: 8-12 Rasboras fish such as Lambchop Rasbora, Harlequin Rasbora, Glowlight Rasbora, Dwarf Rasbora, or Red Dwarf Rasbora. These can be, for example, cherry barb, dwarf gourami, ember tetra, emperor tetra, glowlight tetra, harlequin rasbora, honey gourami, kuhli loach, molly, panda cory, platy, rosy barb, swordtail. The fish breeds in long tanks where the water layer shouldnt exceed 20 cm (8 in); at dim light and in soft water with These include neon tetra, guppies, harlequin rasbora and other smaller fish types. BREEDING Spawning the Harlequin Rasbora can be done by supplying 3 basic needs: 1) Use rain or RO water, 2) High water Temperature, and 3) A suitable spawning plant. These fish are strictly tropical. Age: 3- 5 years. Harlequin ~ 1cm. Sale! Difficulty Level: Moderate. Last edited: 12 Oct 2020. The temperature range of the harlequin rasbora is usually cited as 22 C to 27 C (72 F to 81 F) (for example, Walker, 1971, p. 101) but the fish is capable of living in temperatures from 21 C to 28 C, and indeed usually breeds at around 28 C (82.4 F). and the temperature should be kept at 77 degrees for the ideal breeding environment. They should be housed in an aquarium with plenty of broad leafed plants with a stable water temperature between 76 and 79 degrees F, along with an acidic soft water with a pH of 6.0 to 6.3. Harlequin Rasbora Tetra $ 4.99 $ 4.25-15%. The Harlequin rasbora is an omnivorous fish that will accept most or all store bought foods. Sale! The strawberry rasbora is a lovely red color and marked by a large black dot on its side. Harlequin Rasbora care is quite easy no matter how much experience you have, which is great news 6.0 to 7.5. Harlequin Rasbora Tetra pH: 6 7. pH And hardness A pH of range of 5.5 to 7 is perfect for them to thrive. Water parameters should match their original habitat. 100 available stock. This captivating small fish is very easy to care for which is good for beginners. Often referred to as harlequins, they are one of the most popular rasbora species for home aquariums. When kept in the right temperature range, this species of fish is very hardy and well suited for the beginner hobbyist.
pH.
Final Thoughts. How to Care for the Vibrant Harlequin Rasbora. Then put in their favorite plants Cryptocoryne. When keeping harlequin rasbora, youll note the fish are generally hardy and will adapt to most aquarium conditions, but for best results, add them in soft, slightly acidic water. Fish were well established long before dinosaurs roamed the earth They prefer acidic water and tolerate a decent range of temperatures. pH Level Adult Size: 0.75 inches. Though the fish prefers soft and acidic water, its popularity allowed it adapt to different tank water parameters. If you have chosen harlequin rasbora as a main fish in your tank, buy a school of at least 10 species this way the fish will show its best sides in a tank. For breeding, harlequin rasboras require very soft water; hence the degree of hardness should be within 1dH and 3dH. Sexing. Yes, to prevent temperature fluctuations and maintain the ideal temperature range: Harlequin Rasbora Care Guide & Species Profile June 28, 2022 Robert. The water hardness should not be higher than 1.5 to 2.5 (4) DH when trying to breed this species. Harlequin Rasbora Habitat and Care. Harlequins prefer an environment with areas of dense vegetation, an open area for swimming, a dark substrate, and subdued lighting. Water temperature is not critical, however, the ideal range is 74 to 78 F (23 to 26 C). The pH of the water should be slightly acidic, in the range of 6.0 to 6.5. The males black marking on the body aligns with the dorsal fin. Size: 2 Diet: Omnivore Native to: Asia The Purple Harlequin Rasbora is an extremely desirable aquarium fish due to its gorgeous metallic color and ease of care. These are pretty, vibrant fish that should be kept in a school of at least six. You should keep the temperature level of your water between 73F to 82F. Price: $392.20. Temperature: 72-80 Minimum Tank Size: 10 Gallons Harlequin rasboras are a small and peaceful rasbora that stay under 1" long. Breeding Harlequin Rasboras Unfortunately they are one of the harder species to breed in an aquarium, but it is possible. However, harlequin rasbora fish are quite hardy and adaptable and can withstand up to 82F, particularly when breeding as warmer water is required for conditions to be right. Breeding Harlequin Rasboras can be somewhat challenging however it is possible. Harlequin Rasbora (Trigonostigma Heteromorpha) is not a stranger to the fishkeeping community. Harlequin Rasbora native habitat, distribution, behavior & aquarium compatibility. From the Amazon and Captive Breeders Elsewhere: Neon Tetra. Connect with Tropicali Fish. Trigonostigma heteromorpha, or Harlequin Rasbora, is a very nice school fish for the community aquarium. Average Adult Fish Size: 1.75 inches / 5 cm. Purple Harlequin Rasboras Trigonostigma heteromorpha Temp: 72-77 F KH 6-10 pH 6.0-6.5 Max. Scientific Name : Rasbora Heteromorpha. A slightly warmer temperature (around 80F) will help to encourage spawning. Learn All About the German Blue Ram. Lemon Tetras $ 4.99 $ 3.99. Reactions: And receive 15% off your first order with Tropicali.. Fun Fish Facts. They prefer well-planted aquariums with soft, slightly acidic water. The Harlequin Rasbora likes to be in a school and about 10 gallons is enough for one and if in a small group you need to consider a tank of about 30 gallons to keep them happy. They are schooling fish, so keep them in groups of at least six, without any large predatorial fish. Freshwater Fish Scarlet Badis Care Guide: Tank Mates, Feeding and Breeding February 6, 2019 Robert. They are schooling fish, so keep them in groups of at least six, without any large predatorial fish. The temperature of water is not critical to them but the ideal range would be 74-to78 F (12 to 26 C). depending on the temperature. Temperature: 72-80 Minimum Tank Size: 10 Gallons Harlequin rasboras are a small and peaceful rasbora that stay under 1" long. Breaking up that blue are several pearl-colored spots. The harlequin rasbora (Trigonostigma heteromorpha) is a small fish in the family Cyprinidae. Perhaps you'd hear a fish choir underwater coming from these beautiful fish. Half of the posterior part of the Rasboras body displays a rough triangular marking in a black shade. The temperature of the water should be in a range of 78F 82F ( 26C 28C), with a pH range 5.0 7.0, dGH range 5 12 for them to willing to spawn. It is a good idea to invest in a quality filter for their tank. Scientific Name: Rasbora heteromorpha. Harleqin rasbora. These highly popular fish are known for their beautiful colors and peaceful demeanor. Step 7. Up to 12 dGH. Temperature: 23 27 C ; Maintain soft (GH) acidic water. Step 7. The harlequin rasbora remains small, about 3 3.5 cm (sometimes more in older subjects and depending on the geographical origin). Perform weekly 10 to 20 percent water changes in your harlequin rasbora tank to keep ammonia levels under control and to keep the tank water clear. 3. Additionally, their water temperature should be kept between 72F and 79F. The harlequin rasbora a small fish belonging to the family Cyprinidae, subfamily Rasborinae, which was originally given the scientific name of ''Rasbora heteromorpha''. Put soft water in the tank, aim to stay within 1.5 to 2.5 dkH of their preferred hardness of 7. Lemon Tetras $ 4.99 $ 3.99. Don't try to mix and match. Although undemanding when it comes to water quality, this minnow does not deal with heat well. The Harlequin rasboras life expectancy oscillates between five and six years of age. They like water with a temperature range of between 72 and 80 degrees Fahrenheit and a pH of 6.0-7.8. Harlequin is a very popular species used in home aquariums. Ground-level: For instance, most tropical fish can only do well in water thats around 78 degrees in temperature. When it comes to water temperature you can keep it between 72 and 80 F and the PH level of the water between 6,5 and 7,5 so the middle of 7,0 is ideal for both kinds. Quick Stats. In captivity, Harlequin Rasboras have been bred to withstand a much more varied temperature of around 72F to 81F, and 6.0 to 7.8 pH. Glowlight Tetra $ 4.99 $ 3.99. Temperature: 64 to 72 F (18 to 22 C) Origin and Distribution . Scientific Name: Boraras brigittae. Perform weekly 10 to 20 percent water changes in your harlequin rasbora tank to keep ammonia levels under control and to keep the tank water clear. To keep your Harlequin Rasboras healthy, youll need to make sure you keep them in the proper water conditions.
Spread the loveHarlequin Rasbora SCIENTIFIC NAME: Trigonostigma heteromorpha ADULT SIZE: 1.75 inches (4.5 centimeters) LIFE EXPECTANCY: 6 years Family : Cyprinidae Origin : Southeast Asia, Malaysia, Singapore, Sumatra, Thailand Social : Peaceful, suitable for community tank Minimum Tank Size : 10 gallon Diet : Omnivore Breeding : Egglayer Care : Intermediate pH : 6.0 Temperament: Peaceful. They tolerate a wide range of water conditions, are attractive and active. The Harlequin rasboras are native to South-eastern Asia. The Chili rasbora (Boraras brigittae), also known as the mosquito rasbora, is one of the smallest tropical fish in the aquarium hobby. A Rasbora's Natural Habitat. When harlequin rasbora breeding they become rather demanding as for their pair selection and the surrounding environment. Their temperature requirements arent extraordinary, needing a temperature of only 75 80 degrees Fahrenheit. The water temperature for the pond where a harlequin fish lives must be between 21 and 28 c; The pH of the fish tank should vary between 5.0 and 7.5, while Both Harlequin and Lamb Chop Rasboras thrive well in an optimal water tank temperature of around 76 degrees Fahrenheit. The pH should be approximately 7.2, and the water hardness level is relatively soft. Harlequin Rasbora is a bit tricky species to breed in an aquarium tank, but it is not impossible. Here we are talking about a temperature range considerably lower, at 60 to 70 Fahrenheit (15.5 - 21 Celsius)." This is another small species, maxing out at 0.7 inches (1.8 cm) as an adult. You must prepare for a power backup in case of electricity cut off. Harlequin rasboras are tropical fish and may not thrive in water temperatures below 70 degrees Fahrenheit. Keeping this fish in a large school will ensure its most natural behavior, especially top coloration from males as they compete for the attention of females. The Harlequin rasbora is a hard species to breed. Chili Rasboras/ Mosquito Rasbora. Thus, temperatures should be between 73 and 82 degrees Fahrenheit and pH levels ranging between 6.0 and 7.5. What temperature do rasboras like? This species is native to Asia and is commonly seen around Malaysia, Singapore, and Thailand. When keeping harlequin with betta, maintain them in a tank with the water temperature anywhere between 72F and 87F and a ph of 6 to 7.5. The body has a silvery sheen and is covered in an orange-pink hue. Temperature: 7281F: pH: 4.57.8 pH, depending heavily on the variety of rasbora: Hardness: 215 dGH: Harlequin Rasbora Care Guide & Species Profile Recommended temperature: 23 - 28 C (73.4 - 82.4F) The way how these fish reproduce: Spawning. We offer a wide variety of rasboras here at Aprils Aquarium! Randomly visit a fish store, you will easily encounter this shimmering reddish-copper species. Keep the pH range between 5.5 and 8.0, and the water hardness from 1 to 15 dGH. Harlequin Rasboras are tropical fish that belong to the Cyprinidae family. Age: 3- 5 years. Tank size. Glowlight Tetra $ 4.99 $ 3.99. How to Add Rosy Barb Fish to Your Aquarium. Common name: Rasbora, Harlequin Rasbora, Red Rasbora, Harlequin Fish. Harlequin Rasbora Tetra $ 4.99 $ 4.25 Add to cart. There is evidence that keeping white cloud mountain minnows in water that is constantly above 72 F (22 C) will shorten their lifespan. Freshwater Fish 12 Most Popular Types of Danios February 22, 2022 Robert. The Harlequin Rasbora (Trigonostigma heteromorpha) is a South-East Asian, small shoaling fish that inhabits peat swamps, stagnant creeks and occasional streams. The Purple Harlequin Rasbora is easy in care as long as it has stable water parameters with good water quality. The higher is the temperature, the faster are metabolic processes of the fish, which decreases its lifespan correspondingly. Scientific name: Trigonostigma Heteromorpha. Water temperature: 72F to 80F (74F should be your target) pH levels: 6.0 to 7.8 (6.5 is best) Water hardness: 2 to 15 KH (the lower the better) Fish Size: M. Qty: 100pcs. A pH between 6.0 - 7.5, soft to moderately hard water between 0 - 12 dH and a temperature range of 72 Fahrenheit (22.2 Celsius) and 81 Fahrenheit (27 Celsius) are optimal water conditions for a Harlequin Rasbora. Hardness. Harlequin Rasbora Tetra $ 4.99 $ 4.25-15%. The species became an instant favorite among aquarists after its introduction in the early 1900s and is the best known and most widely kept species among the rasboras. Additional information. The White Cloud mountain minnow can happily live in an unheated aquarium that remains at room temperature. Water temperature: 72F to 78F (some species as high as 80 degrees) pH levels: 7.5 to 8.5; Harlequin Rasbora; Cory Catfish; Swordtail Fish; Molly fish will also get along with most freshwater aquarium shrimp and snails quite well too. Galaxy Rasbora. Price: $392.20. Learn All About the Convict Cichlid. They are native to Asia and most often they are seen in Singapore, Thailand, and Malaysia. Trigonostigma heteromorpha, or Harlequin Rasbora, is a very nice school fish for the community aquarium. A large [] Providing adequate temperature, pH level, oxygen level, etc., should be a priority when taking care of your fish. Temperature Harlequins love warm waters. Wild-caught fish prefer a pH of 5.0 to 7.0 and KH between 1and 3 (20 ppm to 50 ppm). Chili rasboras and water temperature. This captivating small fish is very easy to care for which is good for beginners. 1.
Water temperature: 72F to 80F (74F should be your target) pH levels: 6.0 to 7.8 (6.5 is best) Water hardness: 2 to 15 KH (the lower the better) What is a harlequin rasbora? The Harlequin (Trigonostigma heteromorpha) has been a long-standing favourite in the trade and the rasbora most fishkeepers are likely to keep. If you only have a single Tx bin, just do 90% water changes PLUS wiping down all surfaces (again every 12-24h) Even though Harlequin rasboras are small try to use a 10-20 gal bin - re improved water quality through dilution. The water level should be kept low, lets say about 20cm and the temperature of the water should be set at 28 0 C while the pH range is maintained around 6.0. Temperature: 72 - 79 F (22 - 26 C) It will also accept live and frozen foods that are large enough to fit in its mouth. Dwarf hairgrass is a charming little plant that can be cultivated to create a stunning, vibrant green carpet in your aquarium. The harlequin rasbora has a diamond or lozenge-shaped body that tapers dramatically towards the tail. Always inquire whether a specific smaller fish is the ideal tank buddy before adding to the tank. These excellent freshwater fish are instantly recognizable by the blackish-blue triangular patch on either side of their body. The smaller size makes them a perfect choice for a smaller tank. The body of the Harlequin Rasbora species has a lozenge shape, and from head to caudal peduncle, the basal shade is orange-pink. Add a hang on water filtration in the tank. Temperature between 72 80F (23 28C) Lighting conditions should be subdued Harlequin Rasbora Tank Size The minimum tank size for a small group of Harlequin Rasbora would be 10 gallons. The fish are not true rasboras and were put in the Boraras genus in 1993. Average Temperature : 73 F. It requires very soft acidic water. Captivating and colourful, they made an their introduction into the aquarium world in the early 20th century becoming an instant classic. Harlequin Rasbora General Background The Harlequin Rasbora is a small cichlid fish native to the rivers and streams of Southeast Asia. Harlequin rasboras are tropical fish and may not thrive in water temperatures below 70 degrees Fahrenheit. The eggs will hatch approximately 18 hours later supplied that the water is kept at a temperature of 80 F. Fish Name : Harlequin. They will tolerate a wide range of water chemistry as long as it is clean. The water hardness should not be higher than 1.5 to 2.5 (4) DH when trying to breed this species. Harlequin Rasboras are small and water cleanliness is important to their health and happiness. The pH level in the water needs to be maintained between the ranges of 6.0 to 7.8, which makes the water soft. Do harlequin rasbora need heater?