
Source: Wikimedia Commons
Paguristes cadenati
A small Caribbean hermit crab with scarlet legs and yellow eyestalks that grazes hair algae and cyanobacteria as clean-up crew in an established reef tank. Among the most peaceful hermits, it is easy to keep as long as empty shells are provided.
The scarlet reef hermit crab (Paguristes cadenati) is a small diogenid hermit crab of the western Atlantic from the Caribbean to the Gulf of Mexico and southern Florida. Its scarlet legs contrast sharply with yellow eyestalks and face. An omnivore, it eats detritus and algae, and is especially fond of nuisance growth such as hair algae, slime algae and cyanobacteria, which makes it a valued reef clean-up crew member. It is among the most peaceful hermit crabs and rarely bothers fish, corals or other invertebrates. Keep at 22-26 C, pH 8.1-8.4 and specific gravity 1.020-1.025; in an established tank with algae growth it needs little special care. The key is shell supply: always keep empty shells of several sizes available so it can move up as it grows and molts. Like other invertebrates it cannot tolerate copper-based medications or sudden parameter swings, so acclimate slowly.
Source: Wikipedia (CC BY-SA 4.0)
The Scarlet Reef Hermit Crab grows to Up to about 3.8cm body length.
It lives on reef slopes and coral rubble from 1 to 52 m and reaches about 3.8 cm in body length.
The ideal temperature for the Scarlet Reef Hermit Crab is 22〜26℃.
Origin
Coral reefs of the western Atlantic (Caribbean, Gulf of Mexico, southern Florida)
Size
Up to about 3.8cm body length
Temperature
Sources: LiveAquaria / SeaLifeBase
Edited & verified by: BreederDirect editorial team
The taxonomic, regulatory, and husbandry data on this page are compiled and verified against the authoritative primary sources below.
Accepted name: Paguristes cadenati Forest, 1954
Authority databases: WoRMS
Nomenclature follows global taxonomic authority databases.
Sources: CITES Appendices (species not listed)
Regulations may change. Always verify the latest information with the relevant authorities.
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22〜26℃
Algae, detritus, dried seaweed (omnivore)
Cannot tolerate copper-based medications or sudden parameter swings. Never let empty shells run out.
Suited to an established reef tank with some algae growth. Always keep several empty shells of different sizes available.
22-26 C, pH 8.1-8.4, specific gravity 1.020-1.025. Acclimate slowly on introduction.
Grazes hair algae, slime algae, cyanobacteria and detritus on its own. Supplement with dried seaweed if algae is scarce.
Among the most peaceful hermits and reef safe. Coexists with fish, corals and other invertebrates with little trouble.
Beginner. This is a beginner-friendly species. No special equipment or experience is required, and it can be kept successfully with basic care setup.
The ideal temperature for Scarlet Reef Hermit Crab is 22〜26℃. Avoid sudden temperature changes and maintain a stable environment.
Scarlet Reef Hermit Crab typically reaches Up to about 3.8cm body length as an adult. Size may vary depending on care conditions and individual genetics.
Scarlet Reef Hermit Crab feeds on: Algae, detritus, dried seaweed (omnivore). Aim for a balanced diet with appropriate feeding frequency.
The price of Scarlet Reef Hermit Crab varies significantly depending on morph, size, and lineage. Check our market price page for the latest pricing information.
Last updated: September 15, 2026