Common name: Left-handed Hermit Crab

General Information

The Left-handed Hermit Crab, scientifically known as Calcinus laevimanus, is a fascinating and functional addition to many saltwater aquariums. Its common name stems from its noticeably larger left claw, which it uses for defense and to block the entrance of its borrowed shell. This species is also called the Dwarf Zebra Hermit Crab due to its striking black and white banded legs, which add a touch of elegance to any reef tank.

Native to the Indo-Pacific region, Calcinus laevimanus is a popular choice among aquarists for its role as a diligent cleaner. These hermit crabs are scavengers, consuming algae, detritus, and leftover food, making them valuable members of a clean-up crew. Their small size and peaceful nature make them suitable for a variety of tank setups, including nano tanks and larger reef aquariums.

Care

Caring for the Left-handed Hermit Crab is relatively straightforward, making it an excellent choice for beginners and experienced aquarists alike. They thrive in aquariums with plenty of live rock, which provides both hiding spots and grazing surfaces. These crabs are highly adaptable and can tolerate a range of water conditions, but stable parameters are essential for their long-term health.

Providing an assortment of empty shells of varying sizes is crucial, as Calcinus laevimanus will periodically outgrow its current shell and require a new one. Without suitable shells, they may resort to stealing from other tank inhabitants, leading to potential conflicts.

Diet and Feeding

As omnivores, Left-handed Hermit Crabs are not picky eaters. They naturally graze on algae, detritus, and uneaten food in the tank, helping to maintain water quality. To supplement their diet, you can offer sinking pellets, algae wafers, or small pieces of seafood. Ensuring a varied diet will keep them healthy and active.

Feed sparingly, as overfeeding can lead to water quality issues. These crabs are efficient scavengers and often find enough food on their own in a well-maintained aquarium.

Behavior and Compatibility

The Left-handed Hermit Crab is generally peaceful and coexists well with other tank inhabitants. However, they can become territorial if suitable shells are scarce, occasionally engaging in shell-stealing behavior. Providing a variety of empty shells can help prevent such conflicts.

These hermit crabs are reef-safe and will not harm corals or other invertebrates, making them ideal for reef tanks. They are compatible with a wide range of tank mates, including fish, other hermit crabs, and snails. Avoid housing them with aggressive species that may prey on them.

Health and Common Issues

With proper care, Calcinus laevimanus can live for several years in captivity. Maintaining stable water parameters, providing a varied diet, and ensuring access to suitable shells are key to their health and longevity.

When selecting a Left-handed Hermit Crab, look for active individuals with intact legs and claws. Avoid crabs that appear lethargic or have damaged appendages, as these may be signs of stress or poor health.

While hardy, these crabs can be sensitive to sudden changes in water parameters. Regular water testing and gradual acclimation when introducing them to a new tank are recommended to minimize stress.

Habitat

In the wild, Calcinus laevimanus is found in shallow reef environments and tide pools across the Indo-Pacific region. They prefer areas with plenty of rocks and crevices, which provide shelter and grazing opportunities. Replicating this environment in captivity with live rock and a sandy substrate will help them feel at home.