Microdevario kubotai stats infographicMicrodevario kubotai, known as neon green Rasbora, is a beautiful little cyprinid swimming in the waters of southeast Asian rivers and streams. It can be found in Ranong Province of Peninsular Thailand, while an introduced population exists in the Songgaria River.

Although hard to find, taking care of this tiny fish can be very rewarding if you do it properly. Keep on reading this article if you want to know in-depth about how to take care of these fish, their diet, size, behavior, potential tank mates, and breeding process.

What is Microdevario kubotai?

A Microdevario kubotai is a tiny species of cyprinids inhabiting moderately-flowing headwaters and minor tributaries. This fish is known for owning anal and dorsal fins that are fully transparent. Peaceful in nature and easy to take care of, they make for a wonderful pet.


Here is some quick information about this unique and beautiful fish that will get an idea of its species and how to care for the fish.

Common Name Neon Green Rasbora
Scientific Name Microdevario kubotai
Care Level Easy
Average Lifespan Three to seven years
Maximum Size Around 1 inch
Diet Omnivore
Breeding Type Egg scatterer
Minimum Tank Size 15 gallons


Order: Cypriniformes
Family Cyprinidae
Genera Microdevario
Species M. kubotai

Microdevario Kubotai Care

Although a very hardy fish and is easy to care for; this fish still needs a steady environment to thrive. This is because, just like most other fish, this cute fish is also susceptible to illnesses that affect freshwater fish.

Microdevario kubotai can get stressed, get ich, velvet, and fungal infections in a bad environment, leading to a lot of problems or even death. This is why the fish needs proper care and a proper environment with stable water parameters to grow to its full potential.

– Diet

Microdevario kubotaiSince microdevario kubotai is omnivorous, their diet is pretty simple. However, they still need a balanced and well nutritional diet to have the best quality of life, it is important to give them good quality food. Therefore, the following are some great food items that your fish will love.

  • Baby brine shrimp
  • Cyclopes
  • Daphnia
  • Crushed flakes
  • Micropellets
  • Black worm
  • Bloodworms
  • White worms
  • Mosquito larvae
  • Blanched vegetables like zucchini and cabbage
  • Algae wafers

As you can see, there are many different food items that this small fish can eat. Since the size of the fish is small, make sure to give the food in very small quantities so they can easily eat them.

Moreover, make sure to feed them for a couple of minutes, a few times a day, and remove the rest of the remaining food. This way, the fish will not get obese, and the water quality will not be compromised due to food particles as well.

– Water Parameters

Another factor to consider is the water parameters. The fish thrives in soft and acidic water with water microdevario kubotai temperature of 68 F to 80 F and pH level of 6.0 to 7.0. The hardness of the water should be between 18-179 ppm, and a KH of 2-10 dKH is recommended. As you can see, these parameters are fairly flexible.

However, though the fish is hardy, it still needs constant water conditions without too much fluctuation. It will only strive best when it is living in stable water parameters and good quality water. Furthermore, make sure to monitor the numbers on a regular basis, if any fluctuations are noticed, fix it as soon as possible.

Since this fish is small, many people assume that they don’t need water changes and filtration. This is not true, and this fish can’t be kept in a vase or a bowl. The fish needs partial water changes regularly, and there should be proper filtration of the tank with a moderate flow of water.

– Tank Size

The tank size of microdevario kubotai doesn’t need to be that large since these fish are tiny. Although since you have to keep them in a school, the tank size should not be smaller than 10 gallons. The tank size should also increase according to the amount of fish in the tank if they are kept in a community tank.

A 15-gallon tank will be enough for a school of eight fish, and as the number of fish increases, the tank size should also increase. As a general rule of thumb, with each increasing microdevario kubotai, two more gallons of water should be added to the tank. This size will increase even more with different species of fish.

– Tank Decorations

The fish needs a planted tank with lots of hiding places, especially if you want to keep them in a community tank. These decorations will help the fish feel more at home if they replicate their natural habitat.

To start with the substrate, you can have any substrate you want, but a dark-colored substrate will make the color of this fish pop even more. The substrate can be a mix of gravel, sand, rocks, and stones. Next, the tank should be highly planted with lots of driftwood as well. The fish needs plenty of space to hide, as you know.

– Lifespan

The lifespan of this fish is not as much, but it is not that little as well. If you want to get this fish, be ready to keep it for three to seven years in your care. However, they will only reach the seven-year mark if the tank that they inhabit matches their natural habitat and is well kept.

Microdevario kubotai lifespan also depends on many other factors. The store where you buy the fish should be respectable because sometimes you can get a fish that is already sick, so it will not stay alive for very long.

Moreover, the transportation of this fish can take a toll on its health, so it is important to travel on a smooth road as the bumps will make the fish get sick. Needless to say, be very careful where you buy the fish from if you want it to live long and reproduce.

– Common diseases

There are no fish that are not prone to some diseases. Neon green rasbora are also no exceptions. The most common fish disease for tropical aquariums is ich, which causes white spots all over the body, and may attack your rasbora as well. They are also prone to velvet and different types of fungal infections.

Most of the probable diseases can be avoided if the tank is kept clean, the water is changed on a regular basis, the diet is proper, the parameters are accurate, and any scopes of bacterial infections are eradicated. But if the fish still catches any disease, you should immediately quarantine it and begin the treatment.

Tank Mates

You might think that since this fish is peaceful and timid you could probably keep a lot of tank mates with it, but that is not true at all. Although peaceful, it is more reason for this fish to stay among the species of the same kind. It can be kept with some selected peaceful and small fish.

– Ideal Tank Mates

The best tank mates for your rasbora fish are listed below:

Basically, just make sure that the fish is peaceful and smaller in size. Additionally, make sure to have enough space in the tank for these partners to be extra safe and ensure there is no competition for food and territory.

– Tankmates to Avoid

Rasboras are peaceful fish that don’t like to cause trouble and prefer to be in friendly company. So any boisterous type of fish that owns an aggressive nature and likes to pick fights with calmer fish should be avoided as tank mates. Otherwise there will be fights within the aquarium and your timid rasboras might get injured or even die.

Moreover, these fish are fairly small in size. So you absolutely should not keep fish of larger sizes in the same tank as them. Otherwise, the poor rasboras might end up becoming food to the larger partners.


Another important part of taking care of any fish in the tank is their permanent home even when it comes to breeding. The tank should have conditions that are similar to its natural habitat to have a smooth breeding process. The natural habitat of microdevario kubotai is a calm and well-oxygenated river or stream that is also filled with vegetation and leaf litter that provides the nutrients and places to hide.

– Pre-Breeding Care

Since you will have these fish in a school, it is very easy to breed them. In fact, you will not even need to do anything special to make them breed in a tank that is well maintained. All you have to do is make sure the fish is healthy, by giving them a proper diet filled with protein.

To attract the female, the male fish will display brilliant colors. When the process is successful, they will finally mate. Since they are egg scatterers, you will find their eggs sprinkled over the tank decorations. After the eggs are scattered, you will find the fry will start swimming within 72 hours or two to three days

– Post Breeding Care

Now, there is a high chance that most of this fry will not survive. This is because other fish in the tank, including the parents, might eat the fry. However, some might still survive if they are born in hidden parts. But if you want to make sure that the fry lives, make sure they spawn in a different tank.

After the breeding process is complete, remove the parents from the tank after two to three days. The fry should be fed and kept in a separate tank until they reach maturity, after which they can be introduced to the previous tank.


1. How Big Do Microdevario Kubotai Get?

Microdevario kubotai get to know this species of cyprinidAlthough brilliantly colored, the size of this fish is very small, it can grow up to be around one inch, but that is still a larger size for this fish. To be exact, expect your neon green rasbora to grow up to be around 0.8 inches in size.

The microdevario kubotai growth rate is pretty slow as well and you will not notice it growing very fast. Funnily, the size of the female fish in this fish species is a little bigger than the male counterparts due to the fact that it has to lay eggs.

Since most of the microdevario kubotai are wild-caught, the size of the fish in the wild also is the same as in captivity. To make sure it reaches its full potential, make sure to get a larger tank and keep them in a big school so they will feel relaxed and happy.


Here are some important facts about this fish from this article that you should remember.

  • The fish is in rivers and streams of specific rivers of Southeastern Asia.
  • This small fish reaches the size of around 0.8 inches.
  • The minimum tank size is 10 gallons.
  • Since the fish is so small and peaceful, it can only be kept with other small and peaceful fish.
  • It is easy to breed them but the fry needs to be in another tank to ensure they don’t get eaten.
  • Give them a varied diet but in small amounts.

Microdevario kubotai is a fish that is easy to care for and also makes for a great addition to a tank due to its beautiful colors. Now you are ready to take care of this fish and have it added to your aquarium.

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