Royal Knifefish – Chitala blanci
The Royal Knifefish, Chitala blanci, is one of those freshwater species that immediately captivates demanding aquarists. Its elongated, blade‑like body, shimmering metallic tones and distinctive undulating swimming style make it an unforgettable sight in a well‑planned aquarium. Keeping this fish, however, is reserved for aquarists who are ready to combine passion, patience and high‑quality equipment. With the right approach – and with suitable aquariums and accessories, such as those offered by MB Store – the Royal Knifefish can become a true centerpiece of a large, carefully designed aquatic display.
Origin and natural behavior of the Royal Knifefish
The Royal Knifefish, scientifically named Chitala blanci, belongs to the family Notopteridae, commonly called featherbacks or knifefishes. It comes from Southeast Asia, where it inhabits slow‑moving rivers, floodplains and backwaters with dense vegetation and many hiding places. In nature, these fish are mostly crepuscular or nocturnal: they are most active at dusk and during the night, when they hunt smaller fish, crustaceans and insect larvae.
One of the most fascinating aspects of Chitala blanci is its unique way of swimming. The fish has a long, continuous anal fin that runs along the underside of its body. By creating wave‑like movements with this fin, the knifefish can move both forward and backward with great precision. This allows it to navigate narrow crevices between roots, branches and stones, as well as to approach prey silently and efficiently. In the aquarium, this behavior is often what most fascinates observers and makes the Royal Knifefish a living, moving work of aquatic art.
In its natural environment, Chitala blanci prefers turbid or dimly lit waters, often rich in tannins from decaying plant material. This contributes to a darker, tea‑colored appearance of the water. It uses submerged branches, roots and dense vegetation as shelter during the day. Understanding these natural conditions is essential for creating a suitable aquarium, since mimicking the habitat will help reduce stress, stimulate natural behavior and maximize the fish’s longevity and health.
The Royal Knifefish is a solitary and somewhat territorial species, especially when fully grown. Juveniles may tolerate conspecifics better, but adults can become aggressive toward other knifefishes or fish of similar shape, especially in cramped conditions. At the same time, it is typically shy when kept with too lively or nippy tank mates and can be easily stressed. This duality – combining power with sensitivity – is what makes Chitala blanci such a fascinating but demanding species for experienced aquarists who enjoy designing large, calm community setups around a single, impressive centerpiece fish.
Appearance, size and lifespan
The Royal Knifefish justifies its regal name with a truly majestic appearance. Its body is elongated, laterally compressed and shaped like a curved blade, tapering toward the tail. The dorsal region is relatively short, while the ventral side is dominated by the long anal fin that undulates continuously. The base color is usually silvery‑grey to bronze, with darker shading along the back and subtle iridescent reflections when the light hits it at the right angle.
Depending on the locality and individual, Chitala blanci may display a pattern of spots or irregular blotches along the flanks, sometimes forming eye‑like markings. These spots can be more or less intense, but they always add to the elegance of the fish. The head is relatively small and pointed, with a protrusible mouth adapted for quickly sucking in prey. The eyes are moderately large and positioned to give a good forward and lateral field of vision – another adaptation for life as an ambush predator.
One of the most important aspects to consider before acquiring a Royal Knifefish is its final size. In suitable conditions, adults may reach 60–80 cm in length, and exceptional specimens can become even larger. This makes them completely unsuitable for small or even medium‑sized home aquariums. For this reason, they are often seen sold as small, charming juveniles, which unfortunately leads to many being kept in tanks that are far too modest for their long‑term well‑being.
With proper care, stable water parameters and adequate space, Chitala blanci can live 10–15 years, and sometimes longer. This long lifespan means that acquiring a Royal Knifefish is not a short‑term experiment but a long‑term commitment. The aquarist must be ready not only for the fish’s rapid growth phase but also for the continuous adaptation of the aquarium environment and filtration capacity over the years. High‑quality aquariums, filters and accessories, such as those offered at MB Store, become crucial investments for maintaining a healthy environment throughout the fish’s life.
Another interesting aspect is the fish’s color and body condition over time. Well‑kept Royal Knifefish tend to develop more pronounced iridescence and clearer patterns, while poorly maintained individuals often appear dull, with clamped fins and visible signs of stress. Because of their slender profile, signs of malnutrition or disease also become visible relatively quickly. For this reason, continuous observation and timely reaction to any changes in behavior or appearance are essential for successful long‑term keeping.
Aquarium requirements and tank setup
Given the potential adult size of Chitala blanci, the aquarium for this species must be planned with a long‑term perspective. While a juvenile can temporarily live in a smaller tank, responsible aquarists plan from the beginning for an aquarium of at least 600–800 liters for a single adult fish. Larger systems – 1000 liters or more – are strongly recommended if tank mates are considered. The emphasis should be on surface area and length rather than height, as the fish needs ample horizontal space for swimming and turning.
The shape of the aquarium should allow the Royal Knifefish to move gracefully. Lengths of 200 cm or more are recommended for adult specimens. Narrow, cramped tanks cause stress and can lead to deformities or injuries, especially to the delicate snout and fins. MB Store offers a wide selection of large aquariums and custom solutions that can be adapted to meet the specific needs of big, demanding species such as Chitala blanci, including suitable stands and reinforcement systems capable of supporting the considerable weight of large volumes of water.
Water parameters should be stable and within the following approximate ranges: temperature 25–29 °C, pH 6.2–7.5, and soft to moderately hard water. The Royal Knifefish prefers slightly acidic to neutral conditions with low levels of nitrates and virtually no ammonia or nitrites. This implies the use of efficient biological filtration and regular water changes. For such large fish, powerful external filters or sump systems are almost a necessity, as they generate significant amounts of organic waste. MB Store’s range of external filters, circulation pumps and sumps can help aquarists build a reliable filtration system tailored to the needs of this species.
Lighting should be relatively subdued, at least in the parts of the aquarium where the knifefish spends most of its time. Too intense or direct lighting can increase stress and cause the fish to hide constantly. Floating plants, tall rooted plants and decorative elements can be used to create shaded areas. LED lighting with dimming and programmable cycles – widely available from specialized aquarium retailers – is especially useful to simulate natural transitions between day and night and to adapt brightness to the needs of both plants and fish.
Decorations are key for creating an environment where the Royal Knifefish feels secure. Large pieces of driftwood, root complexes, broad rocks and PVC tubes or ceramic caves can all serve as hiding places. The fish needs retreats where it can rest during the day and feel protected from potential disturbances. Substrates can range from fine sand to smooth gravel; in either case, sharp or jagged materials should be avoided to minimize the risk of abrasions. The layout should allow the knifefish to move behind or between structures without getting stuck or injured.
Because Chitala blanci is a relatively powerful fish, all decorations should be stable and secure. Unstable rocks or lightly placed driftwood can shift if the fish makes a sudden movement, which could cause injury or crack the aquarium glass. Silicone‑bonded rock constructions or correctly assembled backgrounds are better options for long‑term safety. Finally, the aquarium should have a tight and well‑fitted cover, as knifefish can jump or dash upwards if startled. Well‑designed lids and covers, such as those often bundled with aquariums at MB Store, help prevent escapes and reduce evaporation.
Filtration, water quality and equipment
Water quality is crucial for all aquarium species, but large predatory fish such as the Royal Knifefish are particularly demanding in this regard. Their protein‑rich diet produces considerable amounts of nitrogenous waste, which quickly degrade water quality if not properly managed. An oversized filtration system is therefore strongly recommended, combining mechanical, biological and, if needed, chemical filtration elements to maintain a stable and healthy environment.
External canister filters and sump systems are among the most commonly used solutions for big aquariums housing Chitala blanci. These systems offer large volumes for filter media and allow flexible configurations. High‑quality ceramic rings, sintered glass media or bio‑blocks provide extensive surfaces for beneficial bacteria that convert toxic ammonia into nitrite and then less harmful nitrate. Mechanical filtration – sponges and filter floss – captures suspended debris, while optional chemical media such as activated carbon or special resins can help remove dissolved organic compounds or adjust specific water parameters.
A general guideline is to dimension filtration so that the total water volume passes through the filter system at least 3–5 times per hour, but for large, sensitive predatory fish, many aquarists aim even higher. Nevertheless, the water flow in the aquarium must be adapted to the fish’s comfort level: strong turbulence across the entire tank is not advisable, since Royal Knifefish prefer calmer zones. Using multiple output nozzles, spray bars or directional outlets helps distribute flow more evenly, creating both quiet and more dynamic areas.
Heaters are another vital component. Large aquariums lose heat slowly but require reliable and often redundant heating to maintain stable temperatures. Using two or more heaters, each rated for part of the total volume, provides safety in case one unit fails. Modern thermostatic heaters with accurate digital control and integrated protection systems, such as those found at specialized aquarium retailers, offer better temperature stability and energy efficiency. A separate, high‑quality thermometer is always recommended for independent monitoring of water temperature.
Monitoring water parameters does not end with temperature. Regular testing for ammonia, nitrites, nitrates and pH is essential. Test kits – whether liquid or digital – allow aquarists to react early to any undesirable trends. Frequent partial water changes, typically 25–40 % per week, are necessary to keep nitrate levels under control and maintain overall water quality. For large aquariums, this can be logistically challenging, so many keepers rely on water change systems, pumps and hoses to facilitate the process. MB Store’s selection of maintenance accessories, from water conditioners to gravel vacuums and pumps, can significantly simplify routine care for big tanks.
Aeration is also important, particularly in densely stocked aquariums or systems with warm water, where the dissolved oxygen content is naturally lower. Additional air stones, circulation pumps or surface skimmers help promote gas exchange and prevent the formation of stagnant layers. Royal Knifefish appreciate well‑oxygenated water, especially at night when some plants consume oxygen rather than producing it. Keeping an eye on fish behavior – such as frequent surfacing or gasping – is a practical indicator that oxygen levels may need attention.
All this equipment – filters, heaters, lighting and aeration – should be chosen with a long‑term vision. Investing in robust, quality devices at the beginning will reduce the risk of failures, stress for the fish and unexpected additional costs later on. MB Store offers not only aquariums but also a wide variety of reliable equipment from renowned brands, allowing aquarists to build a stable and efficient technical foundation for demanding fish such as Chitala blanci.
Feeding the Royal Knifefish
As a carnivorous predator, the Royal Knifefish requires a protein‑rich diet adapted to its size and feeding behavior. In nature, it hunts small fish, crustaceans, worms and insect larvae. In captivity, one of the big challenges is to find a balanced feeding regimen that meets its nutritional needs while avoiding excessive pollution of the water or the development of unhealthy habits such as refusing prepared foods.
Juvenile Chitala blanci usually accept frozen foods quite readily: bloodworms, blackworms, mysis shrimp, krill and finely chopped pieces of fish or shrimp. Live foods such as small feeder fish or insects can be used occasionally, but they carry the risk of introducing parasites and pathogens. If live food is used at all, it should come from safe and controlled sources. Many experienced aquarists prefer to rely mainly on frozen or high‑quality prepared foods to minimize health risks and better control the nutritional content of the diet.
Getting the Royal Knifefish to accept prepared foods – such as sinking carnivore pellets – is highly desirable but sometimes requires patience. A gradual method works best: initially, offer frozen foods mixed with pellets, ideally when the fish is hungry. Over time, it may start to recognize pellets as edible. Some individuals adapt quickly, while others may resist for longer periods. Consistency, moderation and observation are key. Once the fish accepts pellets, feeding becomes much easier and water quality is easier to maintain, since such foods are typically formulated to reduce waste.
Adult Royal Knifefish should be fed once or twice per day, with the total quantity adapted to their size, metabolism and activity level. Overfeeding is a common problem: uneaten food decomposes quickly in the aquarium and can lead to ammonia spikes, cloudiness and bacterial blooms. A practical rule is to offer only as much as the fish can consume within a few minutes, carefully monitoring its body condition over time. A well‑fed knifefish has a firm, muscular body with no visible emaciation near the dorsal region, but it should not look bloated.
Variety is important to ensure a complete spectrum of nutrients. Rotating between different frozen foods and pellets helps supply essential amino acids, fatty acids, vitamins and minerals. Some aquarists enrich foods with specialized supplements to support immune function and coloration. While this is not strictly necessary if the basic diet is well chosen, it can be beneficial during times of stress, disease recovery or acclimation to new environments.
Because the Royal Knifefish is often shy, feeding sessions should be calm and predictable. Sudden movements near the aquarium, bright lights or boisterous tank mates can cause the fish to stop feeding. Dimming the lights slightly, feeding at the same times each day and using feeding tongs or placing food near the fish’s favorite hiding spot are strategies that help build trust. Over time, many individuals become quite accustomed to their keeper and will emerge confidently whenever they see someone approaching with food.
Temperament and tank mates
The Royal Knifefish is a paradoxical combination of power and timidity. On one hand, it is a capable nocturnal predator able to swallow surprisingly large prey; on the other hand, it can be nervous and easily stressed by hyperactive or aggressive tank mates. Understanding this temperament is crucial when planning a community aquarium around Chitala blanci.
Juvenile knifefish are especially vulnerable to bullying and fin‑nipping. They should not be kept with fast, nippy fish such as certain barbs or large tetras that may target their fins or simply outcompete them for food. At the same time, small fish and invertebrates are at risk of being eaten. Guppies, small rasboras, shrimp and similar species will sooner or later be seen as prey, especially during night hours when the knifefish is most active.
Suitable tank mates are usually robust, peaceful or semi‑aggressive species of adequate size that are too large to be swallowed but not aggressive enough to stress the knifefish. Examples include some larger gouramis, peaceful cichlids such as severums, and big catfish or loaches that occupy different levels of the aquarium. It is important that all inhabitants have sufficient space and hiding places to avoid territorial conflicts and constant competition.
Keeping more than one Royal Knifefish in the same aquarium is risky, especially in modest spaces. Aggression between conspecifics can occur, particularly as they reach adulthood and establish territories. This can lead to constant chasing, injuries and chronic stress. Only extremely large aquariums, with carefully designed layouts and superb filtration, can occasionally accommodate multiple individuals, and even then, there is no guarantee of success. For most aquarists, it is safest to maintain a single specimen as the focal point of the tank.
When adding new tank mates, careful acclimation and monitoring are essential. The introduction should be done slowly, ideally with lights off for a few hours to reduce stress. Observing interactions over the next days is crucial to spot any signs of harassment, hiding, refusal to feed or physical damage. If severe incompatibilities arise, the aquarist must be ready to separate fish and potentially rearrange the community structure.
Finally, noise and vibrations around the aquarium can affect the Royal Knifefish. Placing the tank in a relatively quiet area of the home – away from constant foot traffic, slamming doors or loud speakers – allows the fish to develop a stable routine. Stressed fish may dash unpredictably, risking collisions with the glass or decorations. A calm environment and patient handling are therefore as important as water parameters when it comes to the long‑term health and well‑being of Chitala blanci.
Health, maintenance and responsible fishkeeping
Chitala blanci is relatively robust if kept in suitable conditions, but its size and sensitivity to poor water quality mean that preventive care is essential. Many health problems are not due to exotic diseases but to basic husbandry issues: overstocking, irregular maintenance, inadequate filtration, poor diet or sudden changes in water parameters. Preventing stress is the most effective strategy to keep the Royal Knifefish healthy over the long term.
Regular maintenance starts with routine water changes and substrate cleaning. Because the fish produces significant waste, decaying organic matter can quickly accumulate in the substrate and filter. Using a gravel vacuum during water changes helps remove sediment and reduce the load on biological filtration. Filter maintenance should follow the manufacturer’s recommendations, but sponges and mechanical media usually need rinsing in aquarium water (never under tap water) to preserve beneficial bacteria. Biological media should be disturbed as little as possible and only gently rinsed when absolutely necessary.
Observing the fish daily is another crucial aspect of health care. Changes in behavior – such as loss of appetite, unusually lethargic swimming, gasping at the surface or hiding continuously – may indicate early problems. Physical signs such as clamped fins, spots, lesions, cloudy eyes or sudden emaciation should be taken seriously. Early intervention often makes the difference between a minor issue and a serious disease outbreak.
Common health problems in Royal Knifefish include parasitic infections, bacterial diseases and injuries from collisions or aggressive tank mates. Treatment should always start with improving water quality: large, frequent water changes and checking filtration. Medications might be necessary, but predatory and scale‑reduced fish like knifefishes can be sensitive to certain drug concentrations. It is therefore advisable to follow product instructions carefully and, if possible, consult experienced aquarists or aquatic veterinarians when dealing with severe cases.
Quarantine is an important practice for any aquarist, especially for those who keep high‑value, sensitive fish such as Chitala blanci. New fish, plants or even decorative items can introduce pathogens. A separate quarantine tank – equipped with basic filtration, heater and hiding places – allows for observation and, if needed, treatment of new arrivals before they join the main display. MB Store offers smaller tanks, filtration and accessories that can be configured into effective quarantine systems without excessive cost.
Responsible fishkeeping also means planning for the long‑term future of the fish. Because Royal Knifefish can outgrow many home aquariums, prospective keepers must be sure they can provide suitable accommodation for the full life of the animal. Relying on selling or “donating” the fish later is not a reliable strategy, as large predatory fish are difficult to place and many stores or public aquariums cannot accept them. The best approach is to plan from the beginning, investing in appropriately sized aquariums and durable equipment, such as those available at MB Store, to avoid difficult situations in the future.
Finally, while breeding Chitala blanci in home aquariums is rare and challenging due to its size and specific requirements, understanding its natural life cycle contributes to a deeper respect for the species. In nature, large knifefishes often exhibit complex reproductive behaviors, including nest guarding and parental care. Even if these behaviors cannot be easily replicated in captivity, recognizing them underscores the need to treat these animals not just as decorative objects but as living beings with intricate biological needs.
Royal Knifefish in the broader context of aquariums and aquascaping
From an aesthetic and design perspective, the Royal Knifefish introduces both opportunities and constraints. Its impressive size and distinctive movement make it a natural focal point in any aquarium, but at the same time, its requirements limit compatibility with delicate plants and small, intricate aquascapes. Rather than being a disadvantage, this can be an inspiring challenge for aquarists who enjoy designing large‑scale, dramatic underwater landscapes.
Heavily planted aquascapes with fine‑leaved plants and small hardscape elements are often not ideal for Chitala blanci. The fish’s size and strength pose a constant risk of uprooting plants or displacing decorations. However, this does not mean that a knifefish aquarium must be bare or unattractive. On the contrary, carefully chosen hardy plants – such as large Echinodorus, robust Anubias attached to driftwood, and floating species – can coexist with the fish while contributing to a natural and visually appealing environment.
The layout should focus on large structural elements: massive driftwood branches, broad rock formations, tall root‑like structures and open swimming spaces contrasted with shaded retreats. Such a design not only accommodates the fish’s behavior but also creates a sense of depth and scale that is difficult to achieve in smaller tanks. Properly directed lighting can highlight the iridescent sheen of the Royal Knifefish as it glides between light and shadow, turning each movement into a visual spectacle.
In multi‑species setups, the Royal Knifefish often becomes the star around which the rest of the aquarium is composed. Tank mates are chosen and arranged in such a way that they complement rather than overshadow it. Bottom‑dwelling catfish and loaches can populate the substrate zones, while mid‑water swimmers add movement without challenging the knifefish’s dominance. The aim is not to create the highest number of species possible but to design a stable, harmonious community anchored by one iconic fish.
From the standpoint of the overall hobby, Chitala blanci represents a type of fish that pushes aquarists to move beyond basic setups and engage with more advanced aspects of aquarium design, equipment and maintenance. Housing such a demanding species prompts reflection on filtration capacity, electrical safety, structural stability of stands, redundancy of critical systems and even personal time management to ensure regular care. MB Store supports aquarists at all these levels, providing not only aquariums but also advanced filtration systems, lighting, stands and maintenance tools that are essential for large, complex setups.
Ultimately, the Royal Knifefish serves as a reminder that fishkeeping is not only about colorful, small community fish but also about understanding and respecting the needs of large, specialized species. It offers an opportunity to create imposing aquatic landscapes, deepen technical knowledge and develop a long‑term relationship with a single, impressive animal. For aquarists ready to embrace these challenges, Chitala blanci can be a deeply rewarding and educational centerpiece of their aquarium journey.
FAQ – Royal Knifefish (Chitala blanci)
Is the Royal Knifefish suitable for beginners?
No. Chitala blanci is best for experienced aquarists. Its large adult size, strong filtration needs and sensitivity to poor water quality make it challenging. Beginners usually lack the space, budget and routine needed. It is wiser to gain experience with smaller, hardier species before attempting to keep a Royal Knifefish.
What tank size is recommended for an adult Royal Knifefish?
For a single adult, a minimum of 600–800 liters is recommended, with an emphasis on length (around 200 cm) and width for turning. Larger volumes are strongly preferred, especially with tank mates. Small or medium tanks quickly stunt growth, stress the fish and lead to health problems, so long‑term planning is essential.
Can the Royal Knifefish live with other fish?
Yes, but only with carefully chosen tank mates. Ideal companions are peaceful or semi‑aggressive species of similar or larger size that are too big to be eaten and not prone to fin‑nipping. Small fish will be viewed as prey, and very aggressive species can stress or injure the knifefish, so community design must be thoughtful.
What does the Royal Knifefish eat in the aquarium?
It thrives on a varied, protein‑rich diet: frozen foods like bloodworms, shrimp and fish pieces, plus high‑quality sinking carnivore pellets. Live foods may be offered occasionally but can carry disease risks. The key is moderation and variety, avoiding overfeeding to protect both the fish’s health and overall water quality.
How long does a Royal Knifefish live in captivity?
With proper care, stable water parameters and a spacious aquarium, Chitala blanci can live 10–15 years or more. Its long lifespan means that purchasing one is a serious, long‑term commitment. Adequate space, reliable equipment and consistent maintenance routines must be ensured for the entire life of the fish.
