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Rosewater's Hermit Crab

Clibanarius rosewateri

A rare and diminutive Caribbean hermit crab discovered in 1987. Its small size makes it a pristine, meticulous algae eater for marine nano reefs.

Taxonomy
Class:Malacostraca
Order:Decapoda
Family:Diogenidae
Genus:Clibanarius
Species:Clibanarius rosewateri

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Water Temperature

22 - 26 °C

pH Value

8.1 - 8.4

Water type

Marine

Invertebrate type

Hermit crab

Adult size

3 cm

Minimum group

>= 1

KH

8 - 12 dKH

Ecological role

Scavenger

Species description

Geographical Origin and Habitat: Western Atlantic: coasts of Panama and nearby Caribbean islands. Commonly found in tide pools, rocky shores, and shallow coral reefs at depths from 0 to 10 meters. Endemic to the rocky intertidal zones of Ascension Island in the South Atlantic Ocean, adapted to wave action.
Taxonomy: Family Diogenidae, genus Clibanarius. Hermit crab with a soft abdomen protected by a gastropod shell, which it changes as it grows. Grows to 3.0 cm. Named in honor of the carcinologist Joseph Rosewater, it belongs to the diverse family Diogenidae.
Social Behavior: Peaceful and social scavenger. Spends its time crawling over rocks and sand searching for algae and organic detritus. They are gregarious scavengers that spend their time grazing in groups on rocks and rocky substrate.
Coloration and Sexual Dimorphism: Named in honor of malacologist Joseph Rosewater for his outstanding taxonomic contributions. Sexes are indistinguishable externally; shell selection is based purely on size. The bright red-orange stripes on their walking legs help identify them among other small hermit crabs.

Care, breeding and tankmates

Tank Setup: Suitable for small tanks starting from 20.0 liters. Provide stable rockwork and keep a supply of empty shells of various sizes for growth. Provide a variety of empty snail shells of slightly larger sizes to allow them to moult and swap shells safely.
Diet and Feeding: Omnivorous scavenger. Constantly consumes nuisance algae, organic waste, and leftover fish food on the substrate. Excellent clean-up crew members that feed on hair algae, detritus, and uneaten fish food from the substrate.
Water Quality: Stable marine chemistry parameters: temperature 22.0-26.0 °C, pH 8.1-8.4, specific gravity 1.021-1.025. Sensitive to copper. Maintain stable calcium and magnesium levels to support exoskeleton development and ensure smooth molting cycles.
Compatibility and Tankmates: 100% reef-safe. Excellent member of the clean-up crew. May attack small live snails if empty shells are not provided. Extremely peaceful and safe for all reef aquariums, making them ideal companions for nano-reef setups.
Aquarium Breeding: Releases microscopic zoea larvae into the water column; rearing them to settlement in aquariums is virtually impossible. Spawning is common, but rearing the zoea larvae through their planktonic phases is difficult in home aquariums.
Risks and Diseases: Extremely sensitive to copper treatments. Lack of spare shells causes stress and aggression toward snails. Lack of empty shells is the biggest risk, as it may lead them to attack living turbo snails for their shells.

Geographic Origin and Distribution

Western Atlantic: coasts of Panama and nearby Caribbean islands. Commonly found in tide pools, rocky shores, and shallow coral reefs at depths from 0 to 10 meters. Endemic to the rocky intertidal zones of Ascension Island in the South Atlantic Ocean, adapted to wave action.

Origin

Tropical oceans and reefsCentral America and Caribbean

Invertebrate profile

Diet
Omnivore
The diet of Clibanarius rosewateri typically consists of organic detritus, microalgae, or specific planktonic particles. In a home aquarium, they constantly forage along the substrate or rockwork looking for nourishment. Supplemental feeding with specialized invertebrate pellets or liquid foods may be necessary. Ensuring a varied and nutritious diet will promote vibrant colors and long-term health. Overfeeding should be avoided to maintain optimal water quality.
Ecological role
Scavenger
In the wild, Clibanarius rosewateri plays a crucial role in maintaining the balance of its native ecosystem. They often act as natural cleaners, breaking down waste materials and unconsumed food. Their constant movement helps aerate the sand bed and prevent the buildup of toxic gases. By managing algae growth, they create space for slow-growing corals and sponges to thrive. A balanced aquarium ecosystem relies heavily on their diligent cleaning efforts.
Shock sensitivity
Medium
This invertebrate is highly sensitive to rapid fluctuations in water parameters. Sudden changes in temperature, salinity, or pH can cause severe osmotic shock and death. A slow and careful acclimation process, preferably drip acclimation, is absolutely necessary. Maintain stable aquarium conditions through regular monitoring and automated top-offs. Avoid performing excessively large water changes at once.
Calcium and minerals
Medium
Proper calcium levels are absolutely vital for the structural integrity and growth of this species. They continuously extract calcium carbonate from the water to build their shells, skeletons, or protective tubes. Maintaining calcium levels between 400 and 450 ppm ensures they remain healthy. It is also important to balance alkalinity and magnesium alongside calcium supplementation. Regular testing is required in heavily stocked reef aquariums.
Molting
Yes
If applicable to its morphology, this invertebrate undergoes periodic molting to facilitate growth. During the molting process, the organism becomes extremely vulnerable to predation and stress. It is crucial to provide ample hiding spaces, such as caves or crevices, where they can retreat safely. Do not remove the discarded exoskeleton, as they often consume it to quickly replenish essential minerals. Disturbing them during this delicate phase can lead to fatal complications.
Reproduction
Oviparous
Reproduction in the home aquarium is often challenging and rare for many invertebrate species. Most require highly specific environmental triggers, such as temperature shifts or lunar cycles. The resulting larvae usually have a prolonged planktonic stage, making them difficult to rear. Specialized food sources like phytoplankton are needed to sustain the offspring. Consequently, most specimens available in the hobby are wild-caught or professionally aquacultured.
Compatibility & tankmates
Peaceful
Compatibility varies largely based on the specific species and tank mates. They are generally peaceful but can fall prey to aggressive or predatory fish. Ensure they are housed with calm tank mates that will not nip or harass them. Research individual species requirements to avoid territorial disputes. Always monitor new additions carefully to ensure harmonious interactions.

Image gallery

Licensed images linked to the species or, when marked, to the closest representative taxon.

Related species

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Variants and close relatives

Same atlas type, nearby scientific identity, genus, or family.

Antillean hermit crab

Antillean hermit crab

Clibanarius brasiliensis

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Arethusa Hermit Crab

Arethusa Hermit Crab

Clibanarius arethusa

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Boschma's hermit crab

Boschma's hermit crab

Clibanarius boschmai

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Cook's hermit crab

Cook's hermit crab

Clibanarius cooki

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Danai's hermit crab

Danai's hermit crab

Clibanarius danai

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De Man's Hermit Crab

De Man's Hermit Crab

Clibanarius demani

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Double-striped hermit crab

Double-striped hermit crab

Clibanarius bistriatus

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Striped-leg hermit crab

Striped-leg hermit crab

Clibanarius rhabdodactylus

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Blood-spotted Hermit Crab

Blood-spotted Hermit Crab

Clibanarius cruentatus

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Blue-stripe Hermit Crab

Blue-stripe Hermit Crab

Clibanarius merguiensis

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Chapin's Hermit Crab

Chapin's Hermit Crab

Clibanarius chapini

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Ranson's hermit crab

Ranson's hermit crab

Clibanarius ransoni

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Ambon Hermit Crab

Ambon Hermit Crab

Clibanarius ambonensis

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Blue-eyed Hermit Crab

Blue-eyed Hermit Crab

Clibanarius corallinus

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Blueish Hermit Crab

Blueish Hermit Crab

Clibanarius englaucus

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Carnifex Hermit Crab

Carnifex Hermit Crab

Clibanarius carnifex

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Similar care

Cards with similar requirements, difficulty, habitat, and husbandry profile.

Eurysternus Hermit Crab

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Clibanarius eurysternus

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Lined Hermit Crab

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Clibanarius lineatus

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Pacific Hermit Crab

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Red-stripe hermit crab

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Snellius's hermit crab

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Tricolor Hermit Crab

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Clibanarius sclopetarius

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White-fingered Hermit Crab

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Clibanarius albidigitus

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Yellow-tipped Hermit Crab

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Clibanarius virescens

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Zebra Hermit Crab

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Clibanarius zebra

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Mexican Hermit Crab

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Stebbing's Hermit Crab

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Common Atlantic hermit crab

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Clibanarius clibanarius

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Dwarf Zebra Hermit Crab

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Calcinus laevimanus

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Hidden Hermit Crab

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Calcinus latens

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Two-spotted hermit crab

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Clibanarius bimaculatus

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White hermit crab

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Calcinus minutus

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Last updated: 06/30/2026