Electric Blue Knuckle Hermit Crab

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Size: Medium
Sale price$6.39 Regular price$7.99


The Electric Blue Knuckle Hermit Crab, also known as the Electric Blue Leg Hermit Crab (Calcinus elegans), is a popular marine invertebrate species kept in saltwater aquariums. This hermit crab is prized for its striking blue legs and distinctive appearance.

Here are some key characteristics and information about the Electric Blue Knuckle Hermit Crab:

Appearance: This hermit crab is known for its bright blue legs, which contrast with its reddish-brown or orange body. The blue legs are what give it the "electric blue" name. These crabs have a hard exoskeleton and use empty snail shells as their mobile homes, which they carry on their backs.

Behavior: Like other hermit crabs, the Electric Blue Knuckle Hermit Crab is a scavenger and detritivore. It scavenges for food and helps to clean up debris and algae in saltwater aquariums. They are also known for their entertaining and active behavior.

Habitat: In the wild, these hermit crabs are found in the tropical waters of the Indo-Pacific region. They live in and around coral reefs and rocky substrates.

Care: They are relatively easy to care for in a well-maintained saltwater aquarium. Provide them with plenty of hiding places, suitable snail shells to choose from, and a stable water temperature and quality.

Compatibility: Electric Blue Knuckle Hermit Crabs are generally peaceful and can coexist with a variety of marine species in a reef aquarium. However, they may be aggressive toward other hermit crabs if there is competition for snail shells.

These hermit crabs are popular choices for marine aquarium enthusiasts due to their striking coloration and their beneficial role in cleaning up algae and detritus in the aquarium. Proper care, including maintaining good water quality and providing a variety of suitable shells for them to choose from, is essential for their well-being.


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