Green Neon Rasbora – Microdevario kubotai

Among the many nano fish available to aquarists, the Green Neon Rasbora, Microdevario kubotai, is one of the most eye‑catching and underrated species. Its intense lime‑green glow, peaceful nature and small size make it perfect for planted community aquariums and aquascapes. In this article we will look closely at its natural habitat, behaviour, care requirements and ways to bring out its best colours. You will also find practical tips on equipment and aquarium setup that you can conveniently obtain from MB Store, which offers a wide range of aquariums and accessories tailored to the needs of Green Neon Rasboras and other nano fish.

Origin, appearance and natural behaviour

Microdevario kubotai comes from Southeast Asia, mainly from Thailand and Myanmar. In the wild it inhabits shallow streams, rice paddies and slow‑moving tributaries rich in vegetation. The water there is usually clear to slightly tea‑coloured, with gentle current and plenty of roots, branches and aquatic plants. Understanding these conditions helps recreate a comfortable environment in the home aquarium and maintain the fish in excellent condition.

The most distinctive feature of the Green Neon Rasbora is its intense, fluorescent green stripe running along the body. Under proper lighting this colour can seem almost unreal, especially when a larger group of fish moves together in the middle and upper water layers. The body is slender and delicate, with small, transparent fins that underline the elegant silhouette of this species. Adult individuals usually reach around 2–2.5 cm, rarely slightly more, which makes them ideal for smaller aquariums, even well‑planned nano tanks.

In terms of behaviour Microdevario kubotai is a peaceful schooling fish. It feels best in a group of at least 10–12 individuals, although keeping a larger shoal noticeably increases the sense of security and produces more natural behaviour. The fish constantly move through open water, regularly returning to thickets of plants where they can hide when startled. Their liveliness gives the aquarium a dynamic but still gentle character, without aggression or chasing other inhabitants.

This species is most active during the day and responds strongly to changes in intensity and angle of light. When the aquarium is illuminated from the front or from above with high‑quality LED lamps, the green colour becomes particularly vivid. Calm surroundings, lack of sudden movements near the glass and a good layout of the hardscape will encourage the fish to display their most interesting patterns and behaviours, including subtle interactions within the shoal.

Optimal tank size and layout

Although the Green Neon Rasbora is very small, it should not be kept in cramped conditions. For a basic group of around a dozen fish, a tank of at least 40–50 litres is recommended. A longer front panel, for example a 60 cm or larger aquarium, will be more important than height, as these fish intensively use the horizontal swimming space. MB Store offers a wide selection of ready‑made aquariums as well as complete sets with covers, lighting and filtration, which are ideal as a base for a stylish Green Neon Rasbora setup.

When designing the layout, it is worth drawing inspiration from natural habitats of this species. A combination of roots, branches, stones and dense plants will give the fish numerous hiding spots and a sense of security. A darker substrate, such as fine gravel or sand in brown or black shade, enhances the green colour and helps bring out the subtle shimmer of the fish. Bright, reflective substrate may cause them to be more shy and pale, especially during the first weeks after introduction.

Vegetation plays a key role in the arrangement. Background and midground areas can be planted with fast‑growing stem plants, while the foreground can be filled with low carpets and small rosettes. Floating plants are especially valuable, as they slightly diffuse the light and create a more intimate atmosphere in the upper layers of water. At the same time they help stabilise parameters and provide an additional refuge when the fish feel threatened.

It is also worth planning open spaces for free swimming, particularly in the central part of the tank. Microdevario kubotai likes to patrol a specific area of the aquarium; constantly bumping into obstacles can cause unnecessary stress. A carefully composed aquascape with contrasting zones of vegetation, roots and open water will not only please the eye of the observer, but also support natural activity and proper hierarchy in the shoal.

Water parameters and maintenance

Green Neon Rasboras are relatively adaptable, but long‑term health and intense colouration depend on stable and appropriate water parameters. The optimal temperature range is 22–26°C. In aquariums located in cooler rooms a heater with a precise thermostat is practically essential to avoid fluctuations. MB Store provides modern heaters of various power ratings, which can be matched to the size of the tank and the specific thermal requirements of Microdevario kubotai.

The preferred pH falls between slightly acidic and neutral, typically around 6.0–7.2. General hardness should be low to medium, while carbonate hardness is better on the lower side to keep the water mildly soft. Many aquarists successfully keep this species in moderately hard tap water, but if you want to replicate natural conditions more accurately, you can use RO water mixed with tap water and conditioned with specialised mineral salts.

High water quality is an absolute priority for this species. Microdevario kubotai is sensitive to elevated levels of ammonia and nitrites, and does not tolerate high nitrates in the long term. Efficient biological filtration combined with regular water changes is therefore crucial. A well‑dimensioned internal or external filter from MB Store will provide adequate circulation while protecting the fish from getting sucked into the intake. Additional sponge pre‑filters can further increase safety for small individuals.

Maintenance routines should include weekly water changes of about 25–40%, depending on stocking level and plant mass. During changes it is advisable to gently vacuum the substrate, particularly in areas with weaker flow. At the same time avoid thorough cleaning of filter media too often, in order not to damage the beneficial bacterial colony. Instead rinse sponges and other elements in removed aquarium water, never under tap water. Consistency and moderation are the keys to long‑term stability, which directly reflects on the vitality and resistance of Green Neon Rasboras.

Feeding and nutrition

Although small, Green Neon Rasboras have an excellent appetite and appreciate a diverse diet. In nature they mainly feed on tiny invertebrates, insect larvae and other zooplankton present in shallow waters. In the aquarium they readily accept high‑quality micro‑pellets, very fine flakes and granules dedicated to nano fish. The most important thing is that the food particles are small enough to be swallowed comfortably by their tiny mouths.

For optimal condition and colouration it is worth supplementing dry food with frozen or live food such as daphnia, cyclops, baby brine shrimp or microworms. Introducing such items several times a week enhances natural hunting behaviour and helps build healthy muscle mass without excessive fat accumulation. Regular, varied feeding supports immunity, proper development of internal organs and longer lifespan.

At the same time overfeeding should be strictly avoided. Microdevario kubotai is very quick at catching falling food, and the aquarist may have the impression that the fish are constantly hungry. A better strategy is to provide small portions two or three times a day, observing whether all food is consumed within a few minutes. Any leftovers remaining on the bottom may degrade water quality and encourage the growth of unwanted algae or bacteria.

Another helpful approach is alternating between different types of feed. One day you can offer a complete micro‑granulated mix rich in vitamins and minerals, the next day a frozen food portion, and on another day a plant‑based supplement containing, for example, spirulina. Such rotation ensures a broad spectrum of nutrients that are difficult to fully provide with just one type of preparation.

Tank mates and community setups

Due to their peaceful temperament, Green Neon Rasboras are extremely well suited to community aquariums. However, their very small size means they should not be combined with large or predatory fish that might see them as food. The best companions are other gentle nano species: small rasboras, peaceful tetras, dwarf Corydoras catfish, as well as tiny labyrinth fish such as sparkling gouramis.

When planning tank mates it is worth paying attention not only to the maximum size of potential neighbours, but also to their behaviour. Very active or fin‑nipping fish can stress Microdevario kubotai, causing them to hide constantly and lose colour. It is better to choose species with similar temperament and water parameter requirements, which will calmly share space in the middle and upper levels of the tank.

Invertebrates can also be excellent companions. Shrimp, especially species like Neocaridina and Caridina, often coexist harmoniously with Green Neon Rasboras, provided there are enough plants and hiding spots. Adult shrimp are usually safe, though newly hatched larvae may occasionally be eaten, which in turn can provide a natural supplement to the fish diet. Snails are also generally well tolerated and can assist in cleaning up uneaten food.

A well‑designed community aquarium with these rasboras as one of the main inhabitants allows for very attractive visual effects. The vibrant green of Microdevario kubotai contrasts nicely with red or blue patterns of other species, while harmonious proportions of the shoals create an impression of a colourful, living tapestry. With appropriate planning and high‑quality equipment from MB Store, you can achieve stable, long‑term coexistence of many interesting species in one tank.

Lighting, plants and aquascaping accents

Lighting has a huge impact on the appearance and wellbeing of Green Neon Rasboras. Properly selected LED lamps allow not only lush plant growth but also emphasise the fish’s characteristic neon shine. Modern aquarium lights available in MB Store offer adjustable intensity and colour spectrum, so you can tailor them both to demanding plant species and to the visual presentation of Microdevario kubotai.

For this species a moderate to strong light level works well, although it should not be too harsh or glaring. Balanced illumination combined with darker substrate and background creates favourable conditions for the green stripe on the body to stand out clearly. Introducing a zone with floating plants or slightly dimmed corners also helps fish feel secure and reduces stress during sudden changes in room lighting.

The choice of plants in a tank with Green Neon Rasboras is almost unlimited. They look particularly impressive against a backdrop of bright green stems and moss‑covered roots or stones. By carefully combining textures and shades of green you can create depth and perspective in the aquarium. A well‑planned aquascape can be either nature‑style or more minimalist, but it should always take into account the need for free swimming space in the central part.

Decorative elements such as natural wood and rocks not only decorate the interior, but also create micro‑habitats important for the microfauna. Over time thin biofilm and algae appear on surfaces, serving as an additional food source for invertebrates and some fish. The whole layout, when thoughtfully composed, becomes a coherent system, in which Green Neon Rasboras feel at home and present their behaviour most vividly.

Breeding and raising fry

Breeding Microdevario kubotai in the home aquarium is possible and can be very rewarding, although it requires some planning. This species is an egg scatterer that does not show parental care. In a well‑established, densely planted community tank single fry may appear from time to time, but survival rates are usually low because adults and other fish often eat both eggs and larvae.

To increase the chances of success many aquarists set up a dedicated breeding aquarium. A small tank with mature filtration, soft and slightly acidic water and a mesh or dense plants on the bottom works well. A chosen group of adult fish is transferred there, often with a predominance of females. After an intensive feeding period with nutrient‑rich live and frozen food, spawning is usually stimulated by a larger water change with slightly cooler, fresh water.

Once eggs have been laid, adults should be removed from the breeding tank. Eggs typically hatch within a few days, depending on temperature. Newly hatched fry are tiny and need very fine food such as infusoria or liquid fry food at the beginning. As they grow, you can gradually introduce freshly hatched brine shrimp nauplii and powdered dry food. Clear water, gentle filtration and frequent small changes are extremely important at this stage.

Raising Green Neon Rasbora fry requires patience, but observing their development from transparent larvae to vividly coloured juveniles is fascinating. Successful breeding not only gives the joy of independence from external sources of fish, but also allows you to selectively choose the most robust and colourful individuals for further propagation.

Essential equipment from MB Store

Creating ideal conditions for Green Neon Rasboras is much easier with well‑selected equipment. MB Store offers complete solutions and individual components tailored to the needs of both beginners and experienced aquarists. Choosing the right tank is the first step: panoramic, cube or classic rectangular aquariums are available in many capacities, allowing you to design both modest nano tanks and larger, complex layouts.

Filtration is another critical element. Efficient filters ensure stable biological balance and crystal‑clear water, which is vital for the health of Microdevario kubotai. At MB Store you can choose from internal, external and hang‑on filters with various capacities. For nano setups compact devices with adjustable flow are recommended, while for larger aquariums canister filters provide excellent mechanical and biological filtration with minimal noise and energy consumption.

A reliable heater controlled by a precise thermostat helps maintain a constant temperature, eliminating the risk of dangerous drops at night or during colder seasons. High‑quality lighting, likewise available from MB Store, not only supports photosynthesis in plants but also underlines the beauty of the fish, highlighting their unique colours. Additional accessories such as thermometers, test kits, conditioners and fertilisers round out the equipment, making daily care simpler and safer.

By combining suitable hardware with responsible management practices, you can create an environment where Green Neon Rasboras thrive. Investing in proven, durable products reduces the risk of technical failures and allows you to focus on observation and subtle improvements to the aquascape. As a result Microdevario kubotai becomes not just an attractive decoration, but a central, living element of a balanced underwater world.

Is Green Neon Rasbora right for your aquarium?

Before deciding to add Microdevario kubotai to your collection, it is worth considering your expectations and current aquarium conditions. This species will be perfect for aquarists who value subtle beauty, natural aquascapes and calm community setups. It is not a fish that impresses with size or dominance, but rather with delicate glow and dynamic group movement. In a well‑designed environment it can become the main visual accent of the tank.

Green Neon Rasboras are recommended for both intermediate and increasingly also for ambitious beginners. However, some basic knowledge about water chemistry, filtration and stable maintenance is necessary. Sensitivity to sudden parameter fluctuations and high levels of nitrogen compounds means it is better not to introduce them into newly set up tanks that have not yet completed the biological cycling process. Patience at the start pays off with long‑term wellbeing of the shoal.

When you are ready to meet these requirements, Microdevario kubotai will reward you with intense colours, interesting behaviour and the pleasure of observing a cohesive, lively shoal. With access to properly chosen aquariums, filters, lighting and accessories from MB Store, setting up an ideal home for this species becomes a realistically achievable project rather than a distant dream. Thoughtful planning, regular care and respect for the needs of these delicate fish are the foundations of success in keeping Green Neon Rasboras.

FAQ

How many Green Neon Rasboras should be kept together?
Green Neon Rasboras are schooling fish and should always be kept in groups. The minimum is about 10–12 individuals, but larger shoals look more natural and make the fish feel safer. In a suitably sized tank you can easily keep 20 or more, provided filtration and water changes are adequate to handle the biological load and keep parameters stable.

Can Green Neon Rasboras live in a nano aquarium?
Yes, Microdevario kubotai is very well suited to nano aquariums, but even then space should not be too limited. For a small group of fish, a tank of around 40–50 litres is recommended. A longer aquarium front allows them to swim freely and establish natural group behaviour. Strong filtration and regular maintenance are especially important in smaller volumes of water.

What is the ideal water temperature for this species?
The ideal temperature range for Green Neon Rasboras is 22–26°C. They tolerate slight deviations, but sudden changes should be avoided as they may weaken the fish and increase susceptibility to disease. A reliable heater with thermostat helps maintain stable conditions, particularly in rooms where temperature fluctuates significantly between day and night or between seasons.

Do Green Neon Rasboras need live plants?
While live plants are not absolutely mandatory, they are strongly recommended. Vegetation improves water quality, offers hiding spots and reduces stress, which directly affects the colouration and activity of Microdevario kubotai. Dense planting, floating plants and mosses create a more natural environment, encourage natural behaviour and make the aquarium more visually attractive and easier to stabilise.

Can they be kept with shrimp?
Green Neon Rasboras can generally be kept with shrimp, especially adult individuals, without major problems. However, tiny shrimplets may occasionally be eaten, particularly if there are few hiding spots. To improve survival rates for young shrimp, provide dense vegetation, moss and fine‑leaved plants. Balanced feeding and good layout help maintain harmony between fish and invertebrates.