The Blue Leg Hermit Crabs also known as Tricolor Hermits or Dwarf Blue Legs are tiny powerhouses and used extensively in the marine aquarium hobby for control of nuisance algae including hair algae, diatoms and cyanobacteria. Blue Legs congregate in large numbers in the wild feeding upon many types of algae and do a wonderful job within a reef tank consuming algae as well as leftovers. Size per individual is roughly 1/2″ – 1″ inch shell.
Introduction to Blue Legged Hermit Crab (Algae Eater & Cleanup Crew Essential)
The blue legged hermit crab (Clibanarius tricolor) is a small but effective member of the aquarium cleanup crew, known for grazing on nuisance algae, detritus, and leftover food. Found in shallow reefs and seagrass beds, these crabs are highly adaptable and play a crucial role in keeping aquariums clean.With their bright blue legs and small size, these hermit crabs are an excellent choice for nano tanks and large reef systems alike.
Care Requirements
Care Level: Easy – Low-maintenance and beginner-friendlyMinimum Tank Size: 10+ gallonsAquarium Setup: Requires rockwork, sand, and spare shells for growthBlue legged hermits spend most of their time foraging and are constantly in motion, helping to break down organic waste.
Diet & Nutrition
Blue legged hermit crabs are omnivorous scavengers, meaning they require a mix of algae and meaty foods for a balanced diet.Diet: Omnivorous – Prefers algae, detritus, and leftover foodRecommended Foods:Hair algae, diatoms, and film algaeUneaten fish food and organic wasteAlgae wafers and sinking pellets (if food is scarce)Supplementing their diet with seaweed or meaty foods helps maintain their coloration and longevity.
Lifespan & Growth Rate
Lifespan: 2-4 yearsGrowth Rate: Slow – Typically reaches up to 1 inchAs hermit crabs grow, they must molt and find larger shells to accommodate their size.
Temperament & Compatibility
Temperament: Peaceful to Semi-Aggressive – Can be territorial over shellsReef Safe? Yes – Safe for corals and fish but may target small snails for shellsTo prevent aggression, always provide a variety of empty shells to reduce competition among hermit crabs.
Common Challenges & Considerations
Shell Stealing: May attack snails or other hermits if not provided with empty shells.May Dislodge Corals: Can accidentally knock over frags or small corals while foraging.Opportunistic Scavenger: If underfed, may pick at soft tissue or weakened tankmates.Providing ample food sources and extra shells ensures a peaceful and effective cleanup crew.
Water Conditions
Temperature: 74-80°FdKH (Alkalinity): 8-12pH: 8.1-8.4Specific Gravity: 1.024-1.026Stable
Water Conditions
support healthy molting and long-term survival.
