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The Scarlet Hermit Crab, scientifically known as Paguristes cadenati, is a vibrant and beneficial invertebrate that adds both color and utility to marine aquariums. Recognized for its striking red coloration and algae-eating habits, the Scarlet Hermit Crab is a popular choice among reef enthusiasts.



  • Average Size: 1-2 inches
  • Max Size: 2 inches
  • Tank Size Required: 20 gallons or larger


Temperament: The Scarlet Hermit Crab is generally peaceful and is known for its effective algae control in the aquarium. It is compatible with a variety of reef inhabitants and can be a valuable addition to maintaining a clean and balanced tank.


Unique Traits: As the name suggests, the Scarlet Hermit Crab is characterized by its vibrant red coloration, which makes it stand out in the aquarium. Its claws are adapted for feeding and can also be used for carrying and defending its chosen shell.


Origin: Native to the Caribbean and Western Atlantic, the Scarlet Hermit Crab is often found in rocky or coral-rich areas, where it actively forages for algae and detritus.


Other Names:

  • Red Reef Hermit Crab
  • Cadenat's Hermit Crab


Care Level: Easy


Diet: The primary diet of the Scarlet Hermit Crab includes algae and detritus. It is particularly efficient in controlling hair algae and other undesirable algae types in the aquarium. Additionally, supplement its diet with algae sheets and other marine invertebrate food.


Characteristics and Looks: The Scarlet Hermit Crab displays a vibrant red coloration on its exoskeleton, making it a visually appealing addition to the aquarium. Its claws are relatively large, and it carries a gastropod shell for protection. The overall appearance adds a splash of color and interest to the tank.


Water Parameters:

  • pH: 8.1-8.4
  • gH (General Hardness): 8-12 dGH
  • kH (Carbonate Hardness): 8-12 dKH
  • TDS (Total Dissolved Solids): 32-45 ppm
  • Temperature: 72-78°F


Disclaimer: "Please note that these are general guidelines, and for more accurate values, we encourage you to contact Living Aquarium by phone or in person. Within store hours, our team of experts is always happy to answer any questions you may have and provide personalized guidance on care."

Scarlet Hermit Crab

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