Thai Micro Crab Care: A Beginner’s Guide to Care

If you’re looking for a unique and fascinating addition to your aquarium, the Thai Micro Crab might be just what you need. These tiny creatures are becoming increasingly popular among aquarium enthusiasts due to their interesting behavior and striking appearance. However, caring for these crabs can be a bit tricky, and it’s important to know what you’re getting into before bringing them home.

Thai Micro Crabs require a tank size of at least 5 gallons, water temperature between 72-82°F, and a pH range of 7.5-8.5. They are omnivores and need a varied diet of high-quality pellets or flakes, vegetables, and occasional live or frozen foods. They also require a hiding place and a substrate that allows them to burrow. Regular water changes and tank maintenance are important for their health.

First of all, it’s important to note that Thai Micro Crabs are not your typical aquarium inhabitants. They are incredibly small, with a body size of only about half an inch. This means that they require a very specific environment in order to thrive.

Additionally, they are quite sensitive to changes in water conditions, so it’s important to keep a close eye on your tank’s water parameters.

Despite their delicate nature, Thai Micro Crabs can be a joy to keep if you’re willing to put in the effort. They are fascinating to watch as they scuttle around the tank and interact with one another.

Plus, their unique appearance is sure to be a conversation starter for anyone who sees your aquarium. With the right care and attention, these tiny creatures can make a wonderful addition to your aquatic family.

Thai Micro Crab

Species Summary

If you’re interested in owning a Thai Micro Crab, it’s important to know everything about this unique species. Here’s everything you need to know about Thai Micro Crab care:


The Thai Micro Crab, also known as the Micro Spider Crab, originates from Thailand and other parts of Southeast Asia. They are typically found in freshwater rivers and streams, but can also be found in brackish water.


The lifespan of a Thai Micro Crab is about 1-2 years, but with proper care, they can live up to 3 years.


Thai Micro Crabs are small, with a carapace length of only 1-2 centimeters. They have a round body and long legs, which they use to climb and scavenge for food. They come in a variety of colors, including brown, green, and red.


As mentioned earlier, Thai Micro Crabs are very small, with a carapace length of only 1-2 centimeters. They are not suitable for large aquariums, but can be kept in small tanks or bowls.

Growth Rate

Thai Micro Crabs grow very slowly, taking up to 6 months to reach their full size. It’s important to provide them with a proper diet and clean environment to ensure they grow healthy and strong.

Behavior & Temperament

Thai Micro Crabs are peaceful creatures that get along well with other small freshwater species.

They are scavengers, and will eat almost anything they can find, including algae, dead plant matter, and small insects. They are also very active, and will climb and explore their environment.

Male vs Female

It can be difficult to tell the difference between male and female Thai Micro Crabs, as they have similar physical characteristics. However, males tend to have slightly larger claws than females.

Overall, Thai Micro Crabs are fascinating creatures that are easy to care for and make great pets.

I personally love watching them scavenge for food and climb around their tank. With proper care, your Thai Micro Crab can live a long and healthy life.

Tank Setup

If you’re thinking of keeping Thai Micro Crabs, it’s important to set up their tank properly. Here are some key factors to consider:

Tank Size

The recommended tank size for Thai Micro Crabs is at least 5 gallons. A larger tank will provide more space for the crabs to move around and explore.

Keep in mind that these crabs are very small, so a larger tank may make it difficult to spot them.


Thai Micro Crabs do not require any special lighting. They will do well with standard aquarium lighting, but avoid direct sunlight as it can cause algae growth.

Filtration & Aeration

A filter is recommended to keep the tank water clean and clear. A small sponge filter or hang-on-back filter will work well. Aeration is not necessary but can be beneficial to provide oxygen to the tank.


Thai Micro Crabs prefer a temperature range of 72-82°F. A small aquarium heater can be used to maintain a consistent temperature.

Make sure to use a thermometer to monitor the temperature and adjust the heater as needed.


A fine sand substrate is recommended for Thai Micro Crabs. Avoid using gravel or large rocks, as they can be difficult for the crabs to walk on.

Sand also provides a natural environment for the crabs to burrow and hide.


Decorations such as driftwood, rocks, and caves can provide hiding places and climbing surfaces for the crabs. Avoid sharp decorations that could harm the crabs. Rinse all decorations thoroughly before adding them to the tank.


Live or artificial plants can be added to the tank to provide cover and hiding places for the crabs.

Live plants can also help maintain water quality by absorbing nitrates. Make sure to choose plants that are safe for aquariums and won’t harm the crabs.

Setting up a tank for Thai Micro Crabs can be a fun and rewarding experience. By providing the right environment, you can ensure your crabs are happy and healthy.

Personally, I found that adding a few small decorations and plants really brought my Thai Micro Crab tank to life. Watching them crawl around and explore their new home was a joy to watch.

Water Quality

Proper water quality is crucial for the health and well-being of your Thai Micro Crab. In this section, we will cover the four main aspects of water quality: water temperature, water pH, water hardness, and water changes.

Water Temperature

The ideal water temperature for Thai Micro Crabs is between 72-82°F (22-28°C). It is important to maintain a consistent temperature, as sudden changes can cause stress and even death. You can use a heater to regulate the temperature, and a thermometer to monitor it.

Water pH

Thai Micro Crabs prefer a slightly acidic to neutral pH level of 6.5-7.5.

You can use a pH test kit to measure the pH level of your water. If the pH is too high or too low, you can use pH adjusters to bring it to the appropriate level.

Water Hardness

Thai Micro Crabs prefer soft to moderately hard water with a hardness level of 2-10 dKH.

You can use a water hardness test kit to measure the hardness level of your water. If the water is too hard, you can use a water softener to bring it to the appropriate level.

Water Changes

It is important to regularly change the water in your Thai Micro Crab’s tank to maintain good water quality. You should aim to change 10-20% of the water every week.

When changing the water, be sure to use a dechlorinator to remove any harmful chemicals from tap water.

Personally, I have found that maintaining proper water quality is key to keeping my Thai Micro Crabs healthy and happy.

By regularly monitoring and adjusting the water temperature, pH, hardness, and performing regular water changes, I have been able to keep my crabs thriving.


One of the most important things to keep in mind when caring for Thai Micro Crabs is their diet. Here’s what you need to know:

What To Feed

Thai Micro Crabs are omnivores, which means they eat both plants and animals. You can feed them a variety of foods, including:

  • Algae wafers
  • Bloodworms
  • Brine shrimp
  • Crab cuisine
  • Daphnia
  • Mysis shrimp
  • Spirulina flakes

It’s important to provide a varied diet to ensure that your crabs are getting all of the nutrients they need.


You should feed your Thai Micro Crabs small amounts of food twice a day. Overfeeding can lead to health problems, so be sure to only give them as much as they can eat in a few minutes.


Here are some tips to keep in mind when feeding your Thai Micro Crabs:

  • Remove any uneaten food after a few hours to prevent it from fouling the water.
  • Rotate the types of food you feed your crabs to ensure they are getting a balanced diet.
  • Consider adding a calcium supplement to their diet to help with shell growth.

Personally, I have found that my Thai Micro Crabs really enjoy bloodworms and algae wafers. However, every crab is different, so it’s important to experiment with different foods to see what your crabs like best.

Tank Maintenance

Maintaining a clean and healthy tank is crucial to the well-being of your Thai Micro Crab. Here are a few tips to help you keep your tank in top condition:

First, it’s important to regularly clean your tank. This includes removing any uneaten food, waste, and debris from the bottom of the tank, as well as wiping down the walls and decorations with a gentle aquarium-safe cleaner. I find it helpful to set a weekly reminder on my phone to ensure I don’t forget to clean the tank.

Second, make sure to monitor the water quality in your tank.

Thai Micro Crabs are sensitive to changes in water parameters, so it’s important to keep a close eye on things like pH, ammonia, and nitrate levels. You can test the water using a simple testing kit, which you can find at most pet stores or online.

Third, consider adding live plants to your tank.

Not only do they add a natural and beautiful touch to your aquarium, but they also help to absorb excess nutrients and provide a source of oxygen for your crabs. Just make sure to choose plants that are safe for your crabs and won’t harm them.

Finally, don’t forget to replace your filter media regularly. This helps to ensure that your filter is working properly and removing any harmful substances from the water.

I like to replace my filter media every 4-6 weeks, but you may need to do it more frequently depending on the size of your tank and the number of crabs you have.

Tank Mates

Compatible Fish Species

If you’re planning to keep Thai Micro Crabs with other fish, it’s important to choose compatible species. Peaceful fish that don’t bother the crabs are the best choices.

Some compatible fish species include neon tetras, cherry barbs, and guppies. These fish won’t harm the crabs and can coexist peacefully in the same tank.

Incompatible Fish Species

On the other hand, some fish species are incompatible with Thai Micro Crabs. Aggressive or territorial fish can harm or even kill the crabs.

Avoid keeping cichlids, bettas, and angelfish with Thai Micro Crabs. These fish are known to be aggressive and can pose a threat to the crabs.

How Many Thai Micro Crabs Should Be Together

When it comes to keeping Thai Micro Crabs together, it’s important to have the right number. These crabs are social creatures and thrive in groups of at least three or four.

Keeping them in pairs or alone can lead to stress and aggression. However, overcrowding the tank can also cause stress, so it’s important to find the right balance.

Personally, I’ve found that keeping five Thai Micro Crabs together in a 10-gallon tank works well. They have plenty of space to move around and interact with each other without feeling cramped.

In summary, when choosing tank mates for your Thai Micro Crabs, stick with peaceful fish species and avoid aggressive ones. Keeping the crabs in groups of at least three or four is ideal, but be sure not to overcrowd the tank.

Common Diseases


Thai Micro Crabs are generally hardy creatures, but they can still fall prey to a few common diseases.

One of the most common diseases is shell rot, which is caused by poor water quality. Another common disease is bacterial infection, which can cause lethargy, loss of appetite, and even death.


If your Thai Micro Crab is suffering from shell rot, you may notice that its shell is becoming soft and discolored. In severe cases, the shell may even start to fall apart.

If your crab is suffering from a bacterial infection, it may become lethargic and lose its appetite. You may also notice that its limbs are becoming discolored or that it has developed sores on its body.


If you suspect that your crab is suffering from shell rot, it is important to test your water quality and make any necessary adjustments.

You can also add a calcium supplement to your crab’s diet to help it grow a stronger shell.

If your crab is suffering from a bacterial infection, you may need to administer antibiotics. It is important to consult with a veterinarian before administering any medication to your crab.


The best way to prevent diseases in your Thai Micro Crab is to maintain good water quality. You should test your water regularly and make any necessary adjustments to keep the water clean and healthy for your crab.

You should also provide your crab with a balanced diet that includes plenty of calcium to help it grow a strong shell.

Finally, you should quarantine any new crabs before introducing them to your existing tank to prevent the spread of disease.

Personally, I have had to deal with shell rot in my own Thai Micro Crab. It was a stressful experience, but with proper treatment and care, my crab was able to make a full recovery. Remember, prevention is key to keeping your crab healthy and happy!

Signs of a Healthy Crab

When it comes to Thai Micro Crab care, it’s important to know what signs to look for to ensure your crab is healthy and happy. Here are a few things to keep an eye out for:

  1. Active Movement: A healthy crab will be active and move around the tank frequently. If you notice your crab is lethargic or not moving much, it could be a sign of illness or stress.
  2. Clear Eyes: The eyes of a healthy crab should be clear and free from any discharge or cloudiness. Cloudy or discolored eyes could indicate an infection or injury.
  3. Shiny Shell: A healthy crab will have a shiny and smooth shell. If you notice any bumps, discoloration, or rough patches on the shell, it could be a sign of shell rot or injury.
  4. Healthy Appetite: A healthy crab will have a healthy appetite and actively search for food. If you notice your crab isn’t eating or has a decreased appetite, it could be a sign of illness or stress.
  5. Active Claws: The claws of a healthy crab will be active and move around frequently. If you notice your crab’s claws are limp or not moving much, it could be a sign of illness or injury.

Remember, taking care of Thai Micro Crabs requires attention to detail and a watchful eye. By keeping an eye out for these signs of a healthy crab, you can ensure your crab is happy and thriving in their tank.

Personally, I always make sure to observe my crabs for a few minutes each day to ensure they’re healthy and active. It’s a small but important part of their care routine!

Signs Your Crab is Sick

If you’re a Thai micro crab owner, it’s important to know the signs that your crab is sick. Being able to identify illness early can help you take action and prevent the condition from worsening. Here are some things to look out for:

  1. Abnormal behavior: If your crab is lethargic, not moving much, or not eating, it could be a sign that something is wrong.
  2. Discoloration: If your crab’s shell or legs are turning a different color than usual, it could be a sign of illness.
  3. Shell damage: If your crab’s shell is cracked or damaged, it could be vulnerable to infection.
  4. Abnormal growths: If you notice any unusual growths or bumps on your crab’s body, it could be a sign of disease.

If you notice any of these signs, it’s important to take action right away. Move your crab to a separate tank and consult with a veterinarian who specializes in exotic pets.

Remember that prevention is key, so make sure to keep your crab’s tank clean and provide a balanced diet.

Personal anecdote: When I first got my Thai micro crab, I didn’t know much about their care. One day, I noticed that my crab was not moving much and seemed lethargic.

I did some research and realized that I had not been providing a varied enough diet. I added some more variety to his meals and he perked right up! It’s important to pay attention to your crab’s behavior and make adjustments as needed.


If you are a new Thai Micro Crab owner, you may be surprised to learn that these tiny crustaceans molt regularly. Molting is the process of shedding their exoskeleton so that they can grow bigger.

While molting is a natural process, it can be stressful for your crabs, and it is essential to understand how to care for them during this time.

During the molting process, your crab will be vulnerable and soft, making it more susceptible to injury and disease. Therefore, it is crucial to provide a safe and stress-free environment.

Make sure that you have plenty of hiding places in the tank, and avoid disturbing your crab during this time.

You may notice that your crab is less active during the molting process. This is because it takes a lot of energy to shed their exoskeleton and grow a new one. It is essential to keep the water quality high during this time, as poor water quality can cause stress and illness.

After molting, your crab will eat its old exoskeleton to regain some of the nutrients that were lost during the process. Don’t be alarmed if you see this happening, as it is perfectly normal.

It is also important to note that molting frequency can vary between crabs. Some may molt every few weeks, while others may only molt a few times a year.

Keeping track of your crab’s molting frequency can help you identify any health issues or problems in the tank.

Personally, I was quite worried the first time my Thai Micro Crab molted. It was my first time caring for a crustacean, and I wasn’t sure what to expect.

However, with a little research and patience, I was able to provide a safe and stress-free environment for my crab during the molting process.

Remember, molting is a natural process, and with proper care, your crab will molt successfully and continue to thrive in its tank.


Breeding Thai Micro Crabs can be a fun and rewarding experience. In this section, we’ll cover everything you need to know to successfully breed these tiny crustaceans.

Breeding Setup

To breed Thai Micro Crabs, you’ll need a breeding setup that mimics their natural habitat. This means creating a brackish water environment with a salinity level of around 1.005-1.010. You can achieve this by mixing freshwater and marine salt mix.

You’ll also need a small aquarium with a capacity of at least 5 gallons. Make sure to provide plenty of hiding spots for the crabs, such as rocks, caves, and plants.

How To Breed

Breeding Thai Micro Crabs is relatively easy. Once you have your breeding setup ready, introduce a male and female crab to the tank.

The male will fertilize the female’s eggs, which she will carry on her abdomen until they hatch.

Make sure to keep the water temperature between 75-82°F and provide a varied diet of algae, small pieces of shrimp, and other small foods.

You can also encourage breeding by providing a dark environment and a gradual increase in salinity.


Once the eggs hatch, the baby crabs will be tiny and require special care. They will need a steady supply of food, such as microalgae and small pieces of shrimp.

It’s important to keep the water clean and well-aerated, as baby crabs are sensitive to changes in water quality. You may also need to provide additional hiding spots to protect the young crabs from predators.

With proper care, your baby crabs will grow into healthy adults and may even breed themselves in the future.

I have personally bred Thai Micro Crabs and found it to be a fun and rewarding experience. Seeing the tiny babies grow into adults was truly amazing.

Product recommendations for Thai Micro Crab:

  1. Zoo Med ReptiTherm Under Tank Heater – This under tank heater is perfect for Thai Micro Crab, providing a warm and comfortable environment that will help your crab thrive.
  2. Aqueon LED Aquarium Light Fixture – This high-quality LED light fixture is perfect for Thai Micro Crab, providing bright and energy-efficient lighting that will help your crab thrive.
  3. Fluval Plant and Shrimp Stratum – This substrate is perfect for Thai Micro Crab, providing a natural environment that promotes healthy growth and reproduction.
  4. Zoo Med Nano 10 External Canister Filter – This powerful and efficient canister filter is designed for small aquariums and is perfect for keeping the water in your Thai Micro Crab tank crystal clear.
  5. Tetra Whisper Air Pump – This powerful and reliable air pump is perfect for Thai Micro Crab, providing a steady flow of oxygenated water that will keep your crab healthy and happy.
  6. API Stress Coat – This aquarium conditioner is perfect for Thai Micro Crab, reducing stress and promoting healing in your crab by forming a protective slime coat on their shell.
  7. Hikari Crab Cuisine – This specialized food is perfect for Thai Micro Crab, providing a balanced diet that is high in protein and essential nutrients.
  8. API Freshwater Master Test Kit – This comprehensive test kit is perfect for Thai Micro Crab owners, allowing you to monitor the water quality of your aquarium and ensure that your crab is healthy and happy.


Now that you have learned everything you need to know about Thai Micro Crab care, you can confidently bring one home to add to your aquarium.

Remember to keep their environment clean and well-maintained, and to feed them a varied diet of protein-rich foods.

Make sure to provide them with plenty of hiding places and a suitable substrate, and keep an eye out for any signs of illness or stress.

With proper care, your Thai Micro Crab can live a long, healthy life and bring you joy and entertainment for years to come.

Personally, I have found Thai Micro Crabs to be fascinating and rewarding pets. Watching them scuttle around and interact with their environment is endlessly entertaining, and their small size and low-maintenance needs make them a great addition to any aquarium.

I hope that you have found this guide helpful and informative, and that you are inspired to give these charming little creatures a try.


Here are some frequently asked questions about Thai Micro Crab care:

Q: How often should I feed my Thai Micro Crab?

A: Thai Micro Crabs are scavengers and will eat almost anything, including algae and leftover fish food. You should feed them once a day, but make sure not to overfeed them, as this can lead to poor water quality.

Q: Do Thai Micro Crabs need a heater?

A: Thai Micro Crabs are tropical creatures and prefer water temperatures between 75 and 82 degrees Fahrenheit. It is recommended to use a heater to maintain a consistent temperature in their tank.

Q: Can Thai Micro Crabs live with other fish or invertebrates?

A: Thai Micro Crabs are peaceful creatures and can coexist with other small fish and invertebrates, such as shrimp and snails. However, make sure to provide enough hiding places for your Thai Micro Crab, as they can become territorial and aggressive towards each other if they feel threatened.

Q: How often should I clean my Thai Micro Crab’s tank?

A: You should perform a partial water change and clean the tank once a week to maintain good water quality. You should also remove any uneaten food or debris from the tank to prevent ammonia buildup.

Q: Can I handle my Thai Micro Crab?

A: It is not recommended to handle Thai Micro Crabs, as they are delicate creatures and can easily be injured. Instead, use a small net to move them if necessary.

Personally, I have found that Thai Micro Crabs are fascinating creatures to observe. They are active and curious, and always seem to be exploring their surroundings. With proper care, they can make a great addition to any aquarium.

Reference: Wikipedia.


Hi there! My name is Jacob, and I'm the founder of this Pet people blog that talks all about aquarium and fishkeeping. I've been passionate about fish and aquatic life since I was a kid, and I've spent countless hours learning about different species, their habitats, and how to create the perfect environment for them to thrive in.

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