🐾 LandCare difficulty: IntermediateLegal complexity: Low
Caribbean land hermit crab
Coenobita clypeatus · also called Purple pincher, PP, Soldier crab, Tree crab, Caribbean crab
A long-lived, highly social land crab with a large purple claw that carries a borrowed snail shell as a home. Often sold as a cheap 'starter' pet, it actually has demanding humidity, salt-water, and social needs and can live for decades.
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Quick facts
| Size | Up to about 6 in (15 cm) including shell; large purple-clawed pincher. |
| Lifespan | 10–30 years |
| Social needs | group |
| Native region | Western Atlantic and Caribbean: southern Florida, Bahamas, Bermuda (now rare), West Indies, and the coasts of Central/So |
| Origin | New World |
| Climate | 🌴 Tropical |
| Water type | 🌫️ Brackish |
| Family | Coenobitidae |
| Genus | Coenobita |
Part of the Hermit Crabs
Shell-dwelling crustaceans kept as scavenging cleanup crew. Marine reef hermits graze algae, cyanobacteria, and detritus across live rock and sand, staying small and mostly peaceful; provide assorted empty shells so growing crabs can upgrade homes instead of attacking snails.
Habitat & space requirements
From the minimum an animal needs to be kept humanely, up to the ideal setup. Bigger is almost always better — minimums are floors, not targets.
Life & growth stages
How this animal changes through its life — each stage often has its own care, diet and space needs.
Habitat & enclosure
These crabs must be kept in groups in a humid 'crabitat,' ideally a glass tank of at least 40 L (about 10 gallons) for a few small crabs, with much more space for larger or more individuals. Provide deep, moist substrate of at least 15 cm (6 in) or roughly three times the height of the largest crab, made of a sand-and-coco-fiber mix that holds a tunnel, because crabs must fully bury to molt safely. Offer many empty shells of the correct opening size and shape so each crab can upgrade as it grows.
The defining requirement is two water sources: one dish of dechlorinated fresh water and one of marine salt water (mixed with reptile/aquarium marine salt, not table salt), both deep enough to submerge in and easy to climb out of. Maintain temperatures of 24-27 C (75-82 F) and high humidity of 70-85% with a glass lid and a hygrometer; low humidity suffocates them because they breathe with modified gills. Include climbing branches and hides, and provide low ambient light without intense heat lamps.
Substrate
Provide at least 6 inches—ideally several times the largest crab's height—of moldable substrate (5:1 play sand to coconut fiber, moistened to sandcastle consistency) so crabs can fully bury to molt safely undisturbed. Surface burrowing depth is non-negotiable for survival.
Equipment & setup
A glass tank with under-tank or overhead heating to 75-85F, 70-80% humidity (use a hygrometer and tight lid), and BOTH dechlorinated fresh and marine saltwater pools deep enough to submerge in. Provide ample empty shells of varying sizes and supplemental UVB lighting on a day/night cycle.
Diet
Land hermit crabs are omnivorous scavengers. Offer a varied diet of fresh vegetables and fruit (leafy greens, carrot, mango, coconut, banana), plus protein sources such as cooked egg, bloodworms, or commercial crab/fish foods, and natural items like dried leaves, cuttlebone, and sea-grade calcium. Avoid commercial hermit crab pellets that contain copper sulfate, ethoxyquin, or other preservatives, which are linked to poor health.
They feed mostly at night and eat slowly, so leave food in overnight and remove perishables before they spoil. Calcium and carotenoid-rich foods (carrot, shrimp, marine sources) support healthy molts and shell-color retention. Always keep both the fresh and salt water dishes clean and topped up, as drinking and bathing in both is essential.
Behavior & temperament
These are social, nocturnal animals that should never be kept singly; a group climbs, forages, and even piles together, and isolation causes stress. They are most active at night and during humid conditions. Despite the 'hermit' name they are gregarious, and a healthy colony will be busy after dark. Gentle, occasional handling is tolerated by some individuals, but the large purple claw can pinch defensively.
Enrichment includes climbing branches, hides, a choice of well-fitted spare shells, and deep substrate to dig in. A crab that buries for weeks is almost always molting, not dead, and must not be dug up. Provide variety in food and structures to encourage natural foraging and shell-shopping behavior.
Health
The leading killers are chronically low humidity (impairing gill breathing), lack of proper salt water, and disturbance during the weeks-long underground molt, when the soft crab is extremely vulnerable. 'Post-purchase death syndrome' is common in crabs kept in dry, ill-equipped pet-store conditions. Stress can cause a crab to leave its shell or drop limbs.
Prevent problems with stable high humidity, deep moist molting substrate, both fresh and marine water, preservative-free food, and an absolute rule never to excavate a molting crab. A crab out of its shell needs a quiet, humid, shell-stocked recovery space. Avoid painted shells, which crabs can ingest, and never use synthetic/atmospheric tank toppers near them.
Tips, DIY & hacks
These are highly social, long-lived animals—keep several together, never isolate a molting crab, and never dig up a buried crab. Offer a varied diet (leafy greens, fruit, calcium like cuttlebone, and protein), and provide climbing branches and cork bark for enrichment; avoid painted shells.