Blue Leg Hermit Crab (Clibanarius tricolor)

The Blue Leg Hermit Crab (Clibanarius tricolor)
is a reef safe hermit crab
which eats algae and left over food. The Blue Leg hermit Crab has
become popular in the home aquarium earning its keep by consuming
unwanted algae.

They are an omnivorous bottom feeder which has
been photographed eating red slime algae aka blue green algae aka
cyanobacteria. Many aquarists have observed the Blue Leg Hermit Crab
eating other various types of unwated algae like hair algae and detritus
which feed the growth of nuisance algae of all types.

The Saltwater Blue Leg Hermit Crab also answers
to the names blue-legged hermit crab, tricolor hermit crab, blueleg reef
hermit crab, equal handed hermit crab and blueleg hermit crab.

It is a nice addition to the aquarium as this
crab stands out with it’s bright blue legs. In addition the Blue Leg
hermit Crab has lines of orange and black hence the scientific name
Clibanarius tricolor.

The Blue Leg hermit Crab is a native to the
Caribbean and lives primarily in the tidal zones of rocky areas. These
cabs live together by the thousands clinging to rocks as the tides move.
In low tide they scavenge around to find food. Food to these crabs
consists of anything edible ranging from detritus to algae and left over

Belong to the Class Crustacea and Order Decapoda
these hermits along with Porcelain Crabs belong to the Section Anomura,
which consists of long antennae and four pairs of legs, for a total of 6
walking legs and 2 working legs which usually develop claws to be used
in gathering food, for protection, and to move objects. The head of the
Crab is connected to the thorax and covered by a shell called carapace.
They have a smaller abdomen and tail compared to Shrimp and they keep
this tucked beneath the carapace.

In order for Crabs to grow they need to shed
their exoskeleton, a process called “molting”, which allows them to
remove their restricting shell and begin a new one. Often times in the
home aquarium Crabs will leave this translucent shell in full view so it
can serve as a distraction while the Crab finds a hiding place and
allows its new shell to harden. Hermit Crabs use abandoned shells as
their home. These Crabs usually have extended abdomens that they wrap
around the inside of the spiraling shell leaving only their head and
claws exposed. When approached these Crabs can recoil into the shell for
protection. When a Hermit Crab grows it will often seek out a new
larger shell.

COMMON NAME: Blue Leg Hermit Crab
SCIENTIFIC NAME: Clibanarius tricolor
SIZE AVAILABLE: ~.5-.75 inch
MINIMUM TANK SIZE: 1 crab per gallon
FOOD/DIET: Omnivore
CARE LEVEL: Moderately easy
AVAILABILITY: Most always available – 99%


  • Breakdown on crabs as follows:75% (water volume) Blue Legs, 20% Red Legs, 5% Emerald Crabs
  • Example- 100 gallon tank: 75 Blue Legs, 20 Red Legs, 5-6 Emerald Crabs
  • Reef Safe Hermit crab which eats algae and left over food.
  • Must be provided with additional shells to move into or live snails may be attacked for their shells.
  • Please note: These are aquatic saltwater
    hermit crabs. They must be kept in an aquarium filled with salt water.
    They are not pet land hermit crabs.
  • A nice addition to the aquarium, this crab stands out with it’s bright blue legs.
  • Is an omnivorious bottom feeder and is reef safe.
SKU: CRAB0001 Category: