Minute Hermit Crab

Geographical Origin and Habitat: Widely distributed in the tropical Indo-Pacific, from East Africa to Japan, Australia, and central Pacific islands. Settles on shallow outer reef slopes.

Taxonomy: Member of the family Diogenidae. One of the smallest hermit crabs in the trade, reaching a maximum size of just 1-1.5 cm. Features a smooth, compact body.

Social Behavior: Peaceful, shy, and strongly associated with branching stony corals (such as Acropora, Pocillopora, Stylophora). It remains sheltered within the coral branches.

Coloration and Sexual Dimorphism: Distinctive snow-white or pale cream body, with bright orange or red tips on its claws and walking legs. Eyes are bright blue. No visible sexual dimorphism.

Tank Setup: Suitable for small nano reefs of 5 gallons or larger. Prefers tanks containing branching SPS coral colonies. Tiny empty gastropod shells must be added to allow growth.

Diet and Feeding: Detritivore and herbivore. Feeds on coral mucus, microalgae growing on coral bases, and organic leftovers. Accepts fine sinking pellets and spirulina powder.

Water Quality: Reef parameters. Salinity SG 1.021-1.025, pH 8.1-8.4, temperature 22-28°C. Highly sensitive to copper treatments and elevated nitrates.

Compatibility and Tankmates: 100% reef-safe. Perfect for SPS reef tanks. Compatible with peaceful small fish and corals. May be bullied by larger hermit crab species.

Aquarium Breeding: Microscopic larval stages are pelagic and complex, and do not survive standard home aquarium filtration systems.

Risks and Diseases: Low iodine or calcium leading to failed molts. Lack of suitable tiny replacement shells causes high stress. Highly sensitive to copper treatments.