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The Decorator Arrow Crab, also referred to as the Spider Crab, is a species of crab renowned for its extremely long legs. These legs are what give the crab its name, due to the arrow-like shape of its head and body. The size of the crab can range significantly, with an average size of six inches and some reaching up to 10 inches. Female crabs are usually much smaller. This remarkable creature has an incredible capacity for camouflage, by adorning its body with pieces of algae, rocks and even coral. This unique ability allows the crab to blend into its environment with ease. Moreover, the Decorator Arrow Crab is a popular choice for aquariums, as it is a hardy species that can thrive in a wide range of conditions. It is also easy to care for and provides a unique addition to any tank.
Arrow Crabs are a highly sought after species for saltwater aquariums due to their unique appearance and behavior. They are hardy, tolerant of most water conditions, and have a peaceful demeanor, making them a great addition to most tanks. Additionally, I have found that they are also quite resistant to disease and are fairly easy to feed, as they will eat any food that is offered to them. With proper care and maintenance, these crabs can live up to 8 years in captivity.
It is a hardy, long-lived invertebrate that can be housed in the reef aquarium. This crab has been known to attack crustaceans such as Banded Coral Shrimp, and may even attack small slow moving fish. All crabs are opportunistic feeders and if insufficient food is present they may pick at mushrooms or polyps searching for food. However, Arrow Crabs may provide the beneficial service of eating smaller Bristle Worms which some consider pests. Breeding Arrow Crabs in the aquarium is not generally successful. Larvae are free-swimming and hatch in about two weeks. Arrow Crabs will accept almost all meaty, flake and tablet foods.