Hermit Crab - Algae Eating

Algae-Eating Hermit Crab (Clibanarius spp. / Paguristes spp. – species vary)

Algae-Eating Hermit Crabs are hardworking and fascinating marine invertebrates, prized for their natural ability to keep aquariums clean. These small but active crabs spend their days scuttling over rocks and substrate, feeding on nuisance algae, detritus, and leftover food. Their quirky behaviour and practical usefulness make them a popular choice for reef and marine aquariums.

Common Name:
Algae-Eating Hermit Crab

Scientific Name (Latin):
Commonly Clibanarius spp. or Paguristes spp. (species may vary by supplier)

Maximum Size:
Up to 4–5 cm (depending on species)

Water Type:
Marine

Origin / Natural Habitat:
Widespread across tropical and subtropical reef environments, including the Caribbean, Indo-Pacific, and Red Sea. Found among rocks, coral rubble, and sandy areas.

Water Parameters:

• Temperature: 22–26°C

• pH Range: 8.1–8.4

• Salinity: 1.023–1.025 SG

Temperament:
Peaceful and reef-safe, though they may squabble over shells.

Diet:
Omnivorous scavenger. Feeds on algae, detritus, and uneaten fish food. Supplement diet with algae wafers or dried seaweed if natural food sources are limited.

Minimum Tank Size:
30 litres (larger preferred in reef setups)

Behaviour & Activity:
Very active, constantly foraging over rocks, sand, and glass. They require access to a variety of empty shells as they grow, since they change shells regularly.

Special Requirements or Care Notes:

• Provide a selection of empty shells of different sizes to prevent aggression.

• They are excellent members of a “clean-up crew” for controlling algae and waste.

• Avoid housing with aggressive predators (e.g., certain wrasse, triggers, or puffers).

Suitable for:
Marine aquarists of all levels.

Availability:
Regular in trade.