A small, peaceful hermit crab from the Gulf of California with rusty-red legs, sold as an inexpensive, hard-working algae-and-detritus scavenger. It grazes hair algae, leftover food and some cyanobacteria across rock and sand, and is calmer and less snail-aggressive than many hermits — though, like all hermits, it still appreciates spare shells.
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Small: body and shell to about 2.5 cm (1 in); a compact dwarf-type hermit.
Lifespan
2–4 years
Social needs
group
Native region
Eastern Pacific — Gulf of California (Sea of Cortez) and Mexican coast
Origin
New World
Climate
🌴 Tropical
Water type
🌊 Marine
Family
Diogenidae
Genus
Clibanarius
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.
How this animal changes through its life — each stage often has its own care, diet and space needs.
Photo coming soon
Larva
Most marine invertebrates hatch into microscopic planktonic larvae (such as the zoea of crustaceans or the bipinnaria/veliger of echinoderms and mollusks) that drift and feed in the water column. The larva looks nothing like the adult and undergoes major reorganization.
Photo coming soon
Juvenile
After settling out of the plankton, the juvenile takes on a recognizable miniature of the adult body plan — a tiny shell, a small star, or a translucent shrimp. Crustaceans grow by molting, shedding the exoskeleton to enlarge.
Photo coming soon
Adult
Adults reach full size and reproductive maturity with the species' mature shell, shape, or coloration. Many continue to molt or grow throughout life, and some show sex differences in size or claw/appendage shape.
Color & pattern variants
Natural variants occur in the wild; selectively bred (man-made) variants were developed in captivity.
Natural
Red-legged (typical)
The standard look: rusty-red to orange-red legs, often with paler tips, and a darker body. A natural species, not a bred strain; coloration is consistent across the range.
Habitat & enclosure
Keep a small group in an established reef or FOWLR tank of 10 gallons (38 L) or more with live rock, rubble and a sand bed to forage. Maintain stable reef parameters: temperature 72-80F (22-27C), pH 8.1-8.4, salinity SG 1.024-1.026, alkalinity 8-11 dKH and low nitrate with zero ammonia/nitrite.
Clibanarius digueti is native to the eastern Pacific, especially the Gulf of California (Sea of Cortez) and the Mexican coast, on shallow rocky and sandy bottoms — a warm-water species that adapts well to tropical reef temperatures. Moderate flow and any reef lighting are fine; provide assorted empty shells.
Substrate
Live rock with rubble and crevices plus a sand bed gives it the surfaces it grazes and shelters in. Scatter a range of empty marine snail shells of increasing size so it can trade up without killing tankmate snails.
Equipment & setup
Standard reef equipment suffices: live-rock biofiltration, a heater, a protein skimmer and moderate flow on a copper-free system. Maintain trace iodine for clean molts. A supply of spare empty shells is the key low-cost extra.
Diet
An omnivorous scavenger and grazer that eats hair algae, film algae, detritus, leftover fish food and some species of cyanobacteria, working both rock and sand. One of the more useful and affordable cleanup hermits. In clean tanks supplement with dried seaweed or sinking food so it stays fed.
Behavior & temperament
Peaceful, active and reef-safe toward corals, foraging busily over rock and sand. It is generally calmer and less prone to killing snails than larger hermits, but it is still a hermit: if larger empty shells are scarce it may attack snails or other hermits for an upgrade, and it can nudge loose frags. Keep a group with plenty of spare shells, and don't overstock hermits relative to snails.
Health
As a crustacean it is sensitive to copper (never use copper medications), salinity and temperature swings, and low iodine/trace elements that cause failed molts; maintain trace iodine and stable parameters and drip-acclimate slowly. A motionless, sealed hermit is often molting, not dead — the shed exoskeleton is easily mistaken for a corpse, so don't discard it prematurely. Avoid prolonged air exposure. (Educational only, not a substitute for advice from an aquatic veterinarian.)
Tips, DIY & hacks
A good-value workhorse hermit for hair algae, detritus and leftover food, and one of the more snail-tolerant choices. Stock a group, always provide assorted spare shells, keep the system copper-free, drip-acclimate slowly, and don't mistake a molt for a death.
Reviewed and signed off by: KinStation Editorial — pre-launch draft (pending DVM review) on 2026-06-10