A showy, larger hermit crab in vivid Halloween orange-and-white banded legs, popular as both a colorful display invert and a hair-algae-eating scavenger. It cleans hair algae and mops up leftover food and detritus, but its size makes it more disruptive than dwarf hermits — it can topple frags and, when shells are scarce, kill snails for an upgrade.
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Body to about 5 cm (2 in); a larger, boldly orange-and-white banded hermit.
Lifespan
2–5 years
Social needs
group
Native region
Tropical Indo-Pacific (Red Sea and East Africa to Hawaii)
Origin
Old World
Climate
🌴 Tropical
Water type
🌊 Marine
Family
Diogenidae
Genus
Ciliopagurus
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
Orange-banded (typical)
The standard look: bright orange-and-white horizontally banded legs and a reddish body — the 'Halloween' coloration. A natural species, not a bred strain; color is consistent across the range.
Habitat & enclosure
Keep one or a small group in an established reef or FOWLR tank of 20-30 gallons (75-115 L) or more with plenty of live rock, rubble and hiding spots. Maintain stable tropical 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.
Ciliopagurus strigatus ranges across the tropical Indo-Pacific, including the Red Sea and Hawaii, on shallow coral and rubble bottoms. It naturally favors flattened cone-shell (Conus) shells, so offering a range of empty shells keeps it housed. Moderate flow and any reef lighting are fine.
Substrate
Live rock with rubble and crevices for foraging and shelter is the main need, over a sand or fine-gravel base it can pick through. Critically, scatter a range of empty marine snail shells of increasing size so it can move up without killing tankmate snails for their shells.
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. The cheapest 'equipment' that prevents trouble is a supply of spare empty shells.
Diet
An omnivorous scavenger and grazer: it eats hair and film algae, detritus, leftover food and carrion, helping clear nuisance algae and uneaten food from rock and sand. In clean tanks supplement with dried seaweed, sinking pellets or the occasional meaty morsel so it stays fed and is less tempted to hunt snails.
Behavior & temperament
Active, bold and entertaining, foraging over rock and sand by day and night. Reef-safe toward corals, but with caveats common to larger hermits: it is big enough to bulldoze unattached frags and loose rock, and if empty shells run short it will attack and kill snails (or smaller hermits) to steal a larger shell. Provide a selection of spare shells and don't overstock hermits relative to snails. Generally peaceful toward fish.
Health
As a crustacean it is sensitive to copper (never use copper medications), to salinity and temperature swings, and to low iodine/trace elements that cause failed molts; maintain trace iodine and stable parameters, and drip-acclimate slowly. A hermit that stays sealed and motionless for a long time may be molting rather than dead — the shed exoskeleton is easily mistaken for a corpse, so do not discard it prematurely. Never lift it out into the air longer than necessary. (Educational only, not a substitute for advice from an aquatic veterinarian.)
Tips, DIY & hacks
Buy it for color plus hair-algae cleanup, but treat it as a larger, more disruptive hermit: glue down frags, keep its numbers modest relative to snails, and always provide spare shells (it likes flattened cone shells). Drip-acclimate slowly, keep the system copper-free, 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