Neon Green Rasbora (Microdevario kubotai): Care & Lifespan


Common Name(s)Neon Green Rasbora, Kubotai Rasbora, Green Rasbora
Scientific NameMicrodevario kubotai
OriginSoutheast Asia
Temperature68-80.6°F (20-27°C)
Size0.8 in (2 cm)
Minimum Tank Size15 gal (54 L)
Food & DietOmnivorous
Lifespan3-7 years
Water pH6.0-7.0
Tank MatesCompatible with other peaceful community fish such as rasboras, tetras, and danios.
BreedingEgg scatterer
DiseaseMay be prone to diseases such as ich, velvet, and fungal infections.
Neon Green Rasbora
Neon Green Rasbora (Microdevario kubotai)

The neon green rasbora (Microdevario kubotai), also known as kubotai rasbora, or green rasbora is a cyprinid native to southeast Asian rivers and streams with vivid, eccentric green and yellow colors. These striking little bright green fish may be challenging to find as most neon green rasboras on the market are wild-caught, making these little fish an attractive addition to any fishkeeper’s aquarium. Once stable and well-conditioned, these little fish are easy to take care of and stand out from the crowd in a well-set environment.

Neon Green Rasbora Care

Neon green rasboras thrive in smaller, soft water planted aquaria with dense planting zones with shady bogwood pieces and some floating plants to aid in light diffusion. Originating in the rivers of Thailand and Myanmar, they require moderate water movement to maintain healthy oxygen levels; however, the current cannot be too powerful.

Due to their miniature size and timid nature, neon green rasboras aren’t always compatible with community aquaria. They are most easily kept in a species-only aquarium or alongside other minute fish of similar disposition. However, larger schools along with peaceful tank mates and adequate cover should make them more comfortable in a community aquarium.

Neon Green Rasbora Size

The diminutive neon green rasbora may grow up to between 15 and 20 millimeters in length. Mature females are usually noticeably larger and have deeper bodies than their eccentric-colored, slimmer male counterparts.

Neon Green Rasbora Schooling Behavior & School Size

In nature, neon green rasboras live in schools of 20 – 50 individuals, so it’s wise to bring your new friends home in groups of 8 or more. Keeping these fish in larger schools will create confidence among them and inhibit a beautiful, natural display as males produce their most vibrant colors when competing for female affection.

Neon Green Rasbora Behavior

Most Neon Green Rasboras are quick, active swimmers and are very docile yet easily intimidated when in small numbers. With larger schools they display more vibrant colors and gain more confidence. They are also quite active feeders and prefer moderate current flow, re-enacting their native river habitat.

Neon Green Rasbora Tank Size

Schools of 8 – 12 neon green rasboras will require a 15 gallon tank (54 liters), but the bigger the better. To ensure the most comfortable home for your kubotai rasbora, a general rule for the school is 2 gallons of water per fish.

Neon Green Rasbora Tank Setup

A tank temperature of 68-80.6°F (20-27°C), water pH of 6.0-7.0, and hardness of 18-179 ppm will provide a happy and healthy habitat for your neon green rasboras. With their natural habitat being the warm river waters between the Andaman Sea and the Gulf of Thailand, kubotai rasboras need warm, soft, and acidic water to survive and thrive. Since they naturally inhabit running river waters, neon green rasboras require stable water conditions with moderate current flow and weekly water changes of 30-50% of the tank’s volume to live happily.

Neon green rasboras create a stunning visual effect in a densely planted arrangement set to mimic a flowing stream with dark substrate, variably sized rocks, and gravel, equipped with pieces of driftwood and red/bronze plants.

How to Care for Neon Green Rasboras. Microdevario kubotai – Microrasbora Kubotai.

Neon Green Rasbora Breeding

In a correctly set aquarium with large schools of neon green rasbora conditioned to the tank, spawnings should happen regularly as eggs scatter over the dense vegetation and other decor. These eggs and resulting larvae are a food source for adults, but with plenty of plant cover, some spawns should survive into adulthood.

If many fry are desired, a separate breeding tank should be assembled with enough spawning mops and fine-leaved plants as well as a single well-conditioned couple of neon green rasbora (more individuals will involve a higher probability of egg predation. It’s best to remove the adults after 2 or 3 days since they will eat any eggs or fry they encounter. Incubation relies on temperature to an extent, usually around 3 days, with young green rasboras free-swimming 3-4 days later. Begin feeding the fry with infusoria foods (cultures of algae, amoebas, euglena, paramecium, rotifers, stentor, vorticella) before advancing to crushed flakes, microworms or brine shrimp when they are large enough to consume them.

Neon Green Rasbora Lifespan

With a healthy diet and a good environment within the aquarium, neon green rasboras can live 3 – 7 years. They are highly susceptible to disease during transportation, sometimes making them difficult to find and condition.

Neon Green Rasbora Food & Diet

Neon green rasboras are omnivores and aren’t the pickiest eaters. Although they require a diversified diet to reproduce, they will likely take to most fish flakes and algae wafers. It’s also a great idea to include live or frozen foods in their diets, such as insect larvae, daphnia, bloodworms, tubifex, and brine shrimp. Kubotai rasboras also find certain blanched vegetables like zucchini and lettuce tasty as well.

Feeding tiny fish like green rasboras may prove challenging if they aren’t mature enough. If your fish aren’t large enough to eat flakes or pellets, try crushing them with your fingers before sprinkling into your aquarium.

Neon Green Rasbora Tank Mates

Most easily maintained in a single-species aquarium or with similar-sized species who enjoy similar conditions such as harlequin rasboras, lambchop rasboras, and small tetras, the neon green rasbora is not typically recommended for community aquaria. Green rasboras are peaceful yet apprehensive fish, so they should be kept in schools of around 8-12 to promote confidence among the individuals.

Are Neon Green Rasboras Hardy?

Neon green rasboras are not the hardiest fish, especially compared to other common fish in the aquarium hobby. Neon green rasboras are also very timid, causing them to get stressed easily. However, if they are housed in a suitable environment with other small peaceful fish, there may be no issues at all. Once established in an aquarium, they will become more hardy and resilient to many variables in their environment.

Neon Green Rasbora & Shrimp: Are They Compatible?

Neon green rasboras are compatible with adult dwarf shrimp. While neon green rasboras are omnivorous, they will usually not feed on adult dwarf shrimp. Although most fish prey on the fry of dwarf shrimp, densely planted aquaria will reduce predation. Heavily planted aquaria provide shelter for shrimp fry and exponentially increase the chance of survival to replenish the shrimp population.

Neon Green Rasbora & Betta Fish: Are They Compatible?

Since the best tank mates for betta fish are peaceful bottom dwellers and dwarf schooling fish that are quick enough to keep chasings at bay, a school of neon green rasboras may coexist with a betta fish. Having an abundance of hiding places increases the chance of a comfortable environment for these neighbors.

As betta fish are a territorial species that perceives new companions as intruders, the betta fish must be introduced into the community last regardless of tank size. Aggressive behavior such as fin-nipping may occur if the environment and introductions are not set up correctly. Unfortunately, sometimes betta fish will simply be too aggressive by nature and not allow any tank mates.

Neon Green Rasbora vs. Chili Rasboras

Neon green kubotai rasboras and chili rasboras (mosquito rasboras) are very similar species by nature. Both fish require biologically mature aquaria as they are susceptible to changes in water chemistry. With both species in the same tank, it’s important to maintain schooling numbers to increase confidence among all your fish.

In contrast with the kubotai rasbora’s glowing green color, chili rasboras produce luminous scarlett scales with sleek black accents. A densely-planted aquarium with schools of both neon green and chili rasboras will create a dazzling visual effect.

Neon Green Rasbora Diseases

Neon green rasboras, like many other small fish, are prone to diseases like ich, velvet and certain fungal infections. It’s important to remember that fish kept in schools are likely to quickly spread disease to one another and should always be treated urgently. Ich seems to be the most common disease among neon green rasbora.

Ich is commonly referred to as “white spot disease” and is caused by protozoan “ich bacteria” which are present in all aquaria. Ich takes effect when the fish are under stress and/or have weakened immune systems. Fish will become itchy and develop tiny white spots on their bodies. As the disease progresses it may inhibit respiratory distress, appetite loss, agitation, and ends in death. To treat ich, treatment of the entire tanks and water within the tank is necessary. Raise the temperature of the tank by 80 degrees for 48 hours and the ich protozoan life cycle will accelerate. They will then leave the fish to make tomites and they can then be killed. Use a tank-wide medicinal treatment like Malachite green or Formalin to kill all of the ich protozoans.

Where Can I Find Neon Green Rasbora For Sale?

Neon green rasbora can be purchased from various online retailers and brick-and-mortar pet shops. However, remember that kubotai rasbora are challenging fish to ship and must be handled with care. They may become stressed and/or develop disease en-route to your aquarium, so be sure to pay special attention to your new fish and give them a comfortable, compatible home to thrive in.

Fish Laboratory

With decades of collective fishkeeping experience, we are happy to share the knowledge that we've picked up along the way. Our goal at Fish Laboratory Aquatics is to keep publishing accurate content to help fishkeepers keep their fish healthy.

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