Thai Micro Crab: The Complete Care Guide for Beginners

Dive into the captivating world of Thai Micro Crabs – the tiny wonders of the aquarium! 

Discover their unique charm, fascinating behavior, and the secrets to successfully keeping and breeding these enchanting crustaceans. 

Get ready to embark on an aquatic adventure like no other, as we unravel the mysteries and provide you with the ultimate guide to Thai Micro Crab care and breeding.

Table of Contents

The Thai Micro Crab – Species Summary

Here are the key takeaways you should consider when caring for thai micro crabs:


Thai Micro Crabs have an average lifespan of about 1 to 2 years, depending on the quality of care provided and genetic factors.


These tiny crabs feature a unique appearance with a round-shaped body and long, slender legs.

They have a brownish coloration with dark spots, allowing them to camouflage effectively in their natural habitat.

Average Size

Thai Micro Crabs are truly micro in size, with adults typically measuring around 0.5 to 1 centimeter in width, making them an adorable addition to nano tanks.

Thai Micro Crab Care

Proper care is essential to ensure the well-being of Thai Micro Crabs. Let’s explore the key aspects of their care requirements:

Tank Size

Due to their small size, Thai Micro Crabs can be housed in nano tanks with a capacity of 5 to 10 gallons. A larger tank can accommodate more individuals and provide a more stable environment.

Water Parameters

Maintaining suitable water parameters is crucial for the health of Thai Micro Crabs. They prefer slightly acidic to neutral water with a pH range of 6.5 to 7.5. The temperature should be maintained between 72°F and 82°F (22°C and 28°C). Regular water testing and monitoring are necessary to ensure optimal conditions.

What To Put In Their Tank

Thai Micro Crabs require a well-decorated tank to provide hiding spots and ensure a stimulating environment. Include live plants, driftwood, and small caves to replicate their natural habitat. A sandy substrate or fine gravel is ideal for burrowing.

Common Possible Diseases

Thai Micro Crabs are generally hardy creatures, but they can be susceptible to diseases if kept in poor water conditions. Maintaining clean water, avoiding overfeeding, and providing a stress-free environment are crucial in preventing common diseases such as bacterial infections and fungal growth.

Food & Diet

Thai Micro Crabs are omnivorous, feeding on a variety of food sources. Their diet should consist of a mix of protein-based foods like small live or frozen invertebrates, as well as plant matter such as blanched vegetables or algae pellets. Ensure a balanced diet to promote their overall health and vitality.

Behavior & Temperament

Thai Micro Crabs are generally peaceful and non-aggressive. They spend most of their time scavenging for food and exploring their environment. However, it’s important to note that they can be territorial, especially when kept in close quarters with other individuals.

Tank Mates

When considering tank mates for Thai Micro Crabs, it’s essential to select peaceful species that won’t harm or outcompete them for resources. Suitable tank mates include small fish like endlers, dwarf shrimp, or snails. Avoid keeping them with aggressive or large predatory species that may view the crabs as prey.

Thai Micro Crab Breeding: Unveiling the Reproductive Journey

Breeding Thai Micro Crabs is an exciting endeavor that allows you to witness the natural reproductive behavior of these captivating crustaceans. 

Let’s explore the intricacies of their breeding behavior and the steps you can take to encourage successful reproduction.

Adult Size of Thai Micro Crab

Thai Micro Crabs reach sexual maturity at around 4 to 6 months of age, with males typically growing slightly larger than females. It’s important to provide a proper ratio of males to females in the breeding tank.

Thai Micro Crab Behavior

During the breeding process, males may display courtship behavior, such as waving their claws or performing a dance to attract females. It’s fascinating to observe their natural instincts and intricate behaviors associated with reproduction.

Creating the Perfect Breeding Environment

To provide the best chance for successful breeding, it’s important to create a stress-free environment with suitable hiding spots, plants, and decorations where females can deposit their eggs. 

Ensuring water parameters, such as temperature and pH, are within the optimal range for breeding, is crucial. 

Consistently monitor water quality and perform regular water changes to maintain ideal conditions for the development of the eggs.

Egg Care and Hatching

Once the eggs are laid and fertilized, it’s crucial to provide a separate rearing tank or breeding net to protect the eggs from being consumed by other tank inhabitants. 

Maintain stable water parameters and carefully observe the progress of the eggs. In a few weeks, the eggs will hatch, and tiny crab larvae, known as zoea, will emerge.

Larval Development and Care

As the zoea undergoes several molts and metamorphoses, they will eventually develop into miniature versions of adult Thai Micro Crabs. Providing appropriate food and ensuring proper water quality during this stage is crucial for the survival and growth of the larvae.

Acclimation and Growth

Once the larvae have reached a certain stage of development, they need to be carefully acclimated to their new environment. 

Providing suitable hiding spots and appropriate tank mates is essential to prevent aggression or predation

As they continue to grow and molt, they will gradually transform into adult Thai Micro Crabs.

Thai Micro Crab – Male and Female Difference

Differentiating between male and female Thai Micro Crabs can be challenging. Males tend to have larger and more elongated claws compared to females, while females may exhibit a slightly rounder abdominal area.

Thai Micro Crab Molting

Like other crustaceans, Thai Micro Crabs undergo molting, where they shed their exoskeleton to accommodate their growth. Providing suitable hiding spots and a calcium-rich diet is essential during this vulnerable period to ensure successful molting.

Courtship and Mating

Breeding Thai Micro Crabs often begins with the male exhibiting courtship behavior, such as waving their claws or performing a dance-like display to attract females. This captivating display sets the stage for the mating process. Females carefully select a suitable mate, and once mating occurs, they will carry the fertilized eggs with them.

Thai Micro Crab Tank, Plants and Substrate Decorations

Creating a natural and stimulating environment is crucial for Thai Micro Crab breeding success. 

Live plants, caves, and a sandy substrate can provide hiding places for females carrying eggs and increase the chances of successful reproduction.

Basic Tank Equipment Recommendation

  • Filter
  • Heater
  • Thermometer
  • Test Kit
  • Aquarium Light

Feeding Your Thai Micro Crab

During the breeding process, it’s crucial to provide a balanced and nutritious diet to support the health of the breeding pair and any potential offspring. 

Offer a variety of protein-rich foods, including small live or frozen invertebrates, as well as high-quality plant matter.

Tankmates Thai Micro Crabs with Other Aquatic Animals

When selecting tank mates for Thai Micro Crabs, it’s important to choose species that are compatible in terms of size, temperament, and water parameters. Let’s explore suitable and unsuitable tank mates:

Good Tank Mates:

  • Dwarf shrimp (such as Cherry shrimp or Amano shrimp)
  • Small peaceful fish (such as endlers or celestial pearl danios)
  • Snails (such as Nerite snails or Malaysian Trumpet snails)

Bad Tank Mates:

  • Aggressive fish species
  • Large predatory species
  • Bottom-dwelling fish that may disturb or harm the crabs


Thai Micro Crabs offer aquarists a delightful and unique addition to their tanks. By understanding their care requirements, behavior, and breeding process, you can provide them with a suitable environment to thrive. 

Enjoy the wonders of observing these tiny creatures as they go about their lives, adding charm and intrigue to your aquarium.

Frequently Asked Questions about the Thai Micro Crab

Bogdan Romedea

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