Zebra hermit crab (Calcinus laevimanus) care guide

Group
Other invertebrates
Other names
Left-handed hermit crab, Calcinus herbstii, Pagurus laevimanus, Pagurus lividus
Family
Diogenidae
Origin
Tropical and subtropical Indo-Pacific from East Africa and Madagascar through Indonesia, the Philippines and Australia to Hawaii
Water
saltwater
Maximum size
3 cm
Temperature
22–27°C
pH
8.1–8.4
Hardness
dKH 8–12, SG 1.023–1.025
Minimum tank
75 litres
Care level
beginner
Temperament
semi_aggressive
Reef safe
with_caution

Care

The zebra or left-handed hermit crab is a small, colourful Indo-Pacific hermit with a much larger left claw. The claws are purplish-brown with white fingertips, and the left claw carries a white patch that it uses to signal status in fights. The eyestalks are blue at the base and orange at the tip, and the walking legs are orange-brown with white tips, giving a banded look. It reaches about 3 cm, males usually larger than females. Tank set-up: a reef or fish tank with live rock and rubble; in the wild it lives on rocky reefs and coral rubble from the low intertidal zone downwards. Keep it in a tank with plenty of empty shells. Water: tropical reef conditions of about 22–27 °C, pH 8.1–8.4, dKH 8–12 and specific gravity 1.023–1.025. Clean-up crew: like other small reef hermits it scavenges leftover food and detritus and picks at film algae on rock and sand. But it is an aggressive hermit that fights for empty shells and other resources, and it prefers round shells like those of Turbo and Nerita snails. Hermit crabs need spare empty shells of a slightly larger size, or they may kill snails for their shells. Add several spare round shells for every crab. Our sources cover its biology but not its aquarium care; the figures are general guidance, not from a source. Copper: copper-based medicines are toxic to shrimp, snails and most invertebrates, and some plant fertilisers carry copper too. Never treat a display tank holding this animal with copper; treat fish in a separate hospital tank, and drip-acclimatise new arrivals slowly. Sources: Wikipedia (en.wikipedia.org/wiki/Calcinuslaevimanus). Checked October 2026.

Diet

Omnivorous scavenger: leftover food, detritus and algae. Offer small amounts of sinking pellets, frozen mysis and dried seaweed if the tank is very clean.

Breeding

Females carry about 3,000 eggs per brood under the abdomen; in Hawaii most females are carrying eggs from February to October. The larvae pass through six planktonic zoea stages and a glaucothoe stage before settling, so it is not bred in home aquariums.

Compatibility and tank mates

Generally fine with corals, though it may knock over small frags. It will fight other hermits and may kill snails, especially round-shelled Turbo and Nerita snails, to take their shells, so it is reef safe only with caution. Eaten by triggers, puffers, large wrasses and some crabs.

Last updated 8 October 2026. Community-edited care guide on Aquatic-Auctions.

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