Zebra Hermit Crab

Zebra Hermit Crab (Calcinus laevimanus)

Appearance & Behavior

This marine hermit occupies a protective shelter and explores rockwork and substrate for food.

Quick Care Guide

• Care level: moderate; compatibility and food availability require monitoring.
• Adult size: approximately 1–2 inches body length, with additional space for the occupied shell.
• Minimum aquarium: At least approximately 20 gallons as a conservative starting point; food availability and territory matter more than a fixed stocking ratio.
• Diet: omnivore; algae and appropriate marine foods.
• Reef compatibility: with caution; opportunistic feeding and disturbance remain possible.
• Temperature: approximately 72–78°F for suitable tropical stock; confirm source conditions.
• Specific gravity: approximately 1.023–1.025 for suitable marine stock; match confirmed species requirements and maintain stability.
• pH: 8.1–8.4.
• Alkalinity: 8–12 dKH; prioritize stability.
• Habitat needs: stable rockwork, sheltered molting sites, and protected equipment.

Aquarium Setup & Compatibility

Provide a fully cycled marine system with stable salinity, effective filtration, good oxygenation, and guarded intakes. Provide crevices appropriate to the adult and secure rocks so digging or climbing cannot destabilize them. Use secure containment and avoid narrow equipment gaps.

Provide several clean, unpainted empty marine shells in suitable shapes and progressively larger sizes. Shell preference varies. Spare shells reduce competition but do not guarantee that snails or other hermits will be safe. Avoid triggers, puffers, predatory wrasses, and other crab-eating animals. Keep stocking conservative and do not assume unfamiliar individuals form a compatible pair.

Reef & Invertebrate Compatibility

May eat small or weakened animals, steal food, nip coral tissue, or move unsecured frags. Algae grazing does not eliminate these risks. Snail predation remains possible even with extra shells and supplemental food.

Feeding

Offer suitable marine algae-based preparations alongside small portions of mysis, chopped marine seafood, and quality marine omnivore sinking food. Natural algae and scraps may supplement feeding but should not be assumed to provide a complete diet.

Offer controlled amounts at a frequency suited to the species and condition, and confirm actual intake rather than assuming scavenging supplies enough food. Deliver food near shelter when needed and remove leftovers promptly. Do not overstock a clean-up crew according to a fixed number per gallon or add excess food simply to support unnecessary animals.

Introduction & Long-Term Care

Acclimate carefully to temperature and salinity using a method suited to transport conditions. Transfer in a suitable container where practical, avoiding damage to legs and appendages. Do not pull an animal from its shell or refuge, and keep fingers clear of claws.

Allow undisturbed molting shelter and do not remove an old exoskeleton from the animal by force. An empty molt can resemble a dead crab; check before assuming a loss. Monitor feeding, movement, injuries, and the ability to reach food and refuge. Seek experienced aquatic-veterinary guidance for persistent weakness, food refusal, or repeated molting problems.

Maintain appropriate mineral balance through testing and balanced marine care. Do not dose iodine or other additives blindly. Avoid copper-based treatments and verify medication suitability for the animal before use. Stable water quality and appropriate long-term nutrition matter more than a clean-up crew label.