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The Fiddler Crab (also known as a Halloween Crab) originated from the Hawaiian Islands, but can now also be commonly found in the Florida Keys.
Fiddler Crabs have bright orange and purple shells. They are a very colorful addition to the marine aquarium, and they aid in eating any leftover food that may settle on the substrate. However, they should not be placed in a reef aquarium, because they can become destructive when they reach full size. They may also kill other hermit crabs, so they should not be placed in the same tank with other crabs.
Fiddler Crabs are a valuable addition to an aquarium because they will eat algae, including green hair algae and cyanobacteria. In addition, they provide valuable aeration by sifting through the sand.
If there is an insufficient amount of algae present, the Fiddler Crab will need to be fed dried seaweed, as well as meaty items such as mysis shrimp. However, Fiddler Crabs can also survive quite well on regular hermit crab food...which is to say, like regular hermit crabs, they are scavengers that will eat nearly anything edible.