Blue Leg Hermit Crab

Blue Leg Hermit Crab Overview

• Scientific Name: Clibanarius tricolor

• Common Names: Blue Leg Hermit Crab, Blue-legged Hermit Crab

• Size: About 1 inch (2.5 cm) in leg span

• Lifespan: 2–3 years in good conditions

• Coloration: Translucent body with striking bright blue legs and claws, often with orange or red highlights

• Temperament: Peaceful, active scavenger

• Habitat: Marine, commonly found in coral reefs

Tank Setup

• Minimum Tank Size: 10 gallons for a few crabs

• Environment:

  • Established marine or reef aquarium with stable parameters

  • Plenty of live rock and hiding spots

  • Sand or crushed coral substrate (to allow burrowing)

• Water Movement: Moderate flow mimics natural reef conditions

• Lighting: Standard reef lighting is fine

 Stable water parameters are crucial for their health.

Diet

• Type: Omnivore / Scavenger

• Feeding Frequency: Opportunistic feeder; supplemental feeding 2–3 times per week

• Diet Options:

  • Algae and detritus naturally present in the tank

  • Prepared foods like algae wafers, shrimp pellets, flakes

  • Occasional meaty foods such as finely chopped seafood

• Role: Excellent at cleaning leftover food, algae, and detritus

Behavior & Tank Mates

• Temperament: Peaceful and shy

• Best Tank Mates:

  • Reef-safe fish (clownfish, gobies, blennies)

  • Other reef invertebrates (snails, shrimp)

• Avoid: Aggressive crabs, larger predatory fish, and anemones that might harm them

Special Care Tips

• Shells: Provide an assortment of empty shells of varying sizes for crabs to switch as they grow

• Handling: Avoid excessive handling—delicate and prone to stress

• Compatibility: Safe for reef tanks; do not keep with large predatory crabs or fish

• Molting: Hermit crabs molt regularly and may hide for days during this vulnerable time

Fun Fact

Blue Leg Hermit Crabs are among the most popular cleanup crew members in saltwater aquariums because of their vibrant colors and excellent algae-eating habits.