Snellius's Hermit Crab

Geographical Origin and Habitat: Common in various areas of the central Indo-Pacific, particularly Indonesia, the Solomon Islands, and northern Australia. Inhabits shallow coral reefs and sandy flats.

Taxonomy: Member of the family Diogenidae. A dwarf hermit crab species reaching about 2-3 cm. Has a curved abdomen protected by small empty shells changed as it grows.

Social Behavior: Peaceful, social, and industrious. Coexists peacefully in groups. Spends time exploring rocks and crevices for food without bothering other inhabitants.

Coloration and Sexual Dimorphism: Body color is mostly uniform dark brown, dark olive, or grey-brown. Claws and legs lack clear stripes but may show beige highlights at the joints. No visible sexual dimorphism.

Tank Setup: Suitable for small nano reefs of 5 gallons or larger. Provide plenty of live rock for climbing. Small empty gastropod shells must be added to allow growth.

Diet and Feeding: Herbivore and detritivore. Consumes green hair algae, film algae, diatoms, and leftover fish food. Accepts spirulina wafers and sinking pellets.

Water Quality: Stable marine parameters: SG 1.020-1.025, pH 8.1-8.4, temperature 22-28°C. Highly sensitive to copper treatments and elevated nitrates.

Compatibility and Tankmates: 100% reef-safe. Perfect Clean-Up Crew (CUC) member. Compatible with peaceful fish and corals. May occasionally target small live snails if empty shells are lacking.

Aquarium Breeding: Microscopic zoeal larvae are pelagic and require open ocean salinity to develop, making aquarium breeding unsuccessful under normal conditions.

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