Fiddler Crabs – What Can Live With Fiddler Crabs?

Fiddler crabs require an aquarium tank that mimics their saltwater/freshwater environment. A local exotic animal veterinarian or pet store that sells this animal will be able to offer guidance.

Male crabs typically coexist peacefully, though males may become territorial or fight over females. Crabs typically cohabit with other crabs from their species as well as fish that need brackish water habitat such as Guppies, Mollies and Bumblebee Gobies.

Table of Contents


Fiddler crabs make an exciting and beneficial addition to a fish tank, helping keep it clean by cleaning up any leftover food, while adding visual interest by digging and crawling around on the sand. To maximize their potential in terms of cleanliness and visual interest, these little guys should be kept out of direct sunlight, in an aquarium with sloped sand that slopes down one side, which fills up halfway with water; you could also add live or plastic aquarium plants and driftwood pieces as additional enrichment features.

Crabs are omnivorous scavengers that feed on algae, flake food, pellet food for scavengers, brine shrimp, bloodworms, blanched zucchini and seaweed. Crabs molt regularly shedding off old exoskeletons while regrow claws and legs. While this process takes place they might appear lifeless for several days during which it should be left alone so their new exoskeleton hardens fully.

While cichlids can live peacefully alongside fiddler crabs, their presence should generally be limited to tanks with smaller, less aggressive fish species that won’t be targeted by their large claws. Aggression usually isn’t an issue among these creatures; however males may get into territorial disputes and fights over females which could result in one losing an arm in battles over territory and mating rights; such disputes and fights have the potential of ending badly for all involved parties involved.

Fiddler crabs require brackish water, which you can create by mixing aquarium salt into the tank’s water. Regular changes should be conducted to maintain optimal chemistry and prevent it from becoming either too acidic or alkaline, and ensure optimal living conditions for these aquatic inhabitants.


Fiddler crabs are decapod crustaceans with ten legs and an armor-plated carapace protecting their internal organs. Male fiddler crabs have one claw on each side of their bodies; males typically possess a much larger claw than their counterparts in females. Fiddler crabs prefer brackish water environments and feed off bits of organic debris from the sand as scavengers; this species tends to remain calm and quiet in social settings with other fiddler crab species while males may fight over territory or females competing for female attention – best kept separate in separate tanks if present.

Crabs need to be fed a commercial diet designed for crabs, available from any pet store that sells fish and crab food. You should also provide them with a range of foods like zucchini, blanched peas, raw or boiled fish and freeze-dried plankton and shrimp as a diet source. It’s important to limit their feedings since these creatures typically only consume small amounts while in nature; additionally it’s key to keep the water clean by installing filters into aquariums to prevent bacteria growth in tanks containing these creatures.

To keep pet crabs healthy, it is recommended that 20% of their water be changed out every few days. You can purchase a tank from any major retailer or pet store and make sure it has an secure lid; lay sand at the bottom, add rocks or pieces of driftwood as decor; place plastic or live aquarium plants into their habitat, along with PVC pipes they can climb onto and hide in.


Fiddler crabs are decapod crustaceans found on ocean beaches within the inter-tidal zone. They burrow into the sand for mating, rest and shelter before returning to water as the tide rises. When kept as pets in captivity, fiddler crabs require both sand and brackish (part saltwater/part freshwater) water; to achieve optimal conditions in their environment it may require the use of filters.

Fiddler crabs require the perfect tank size in order to remain stress-free environments, preferably an aquarium, glass container or plastic box with adequate dimensions. Be wary of overcrowding your crabs and make sure their enclosure is escape-proof – for four or fewer crabs a 10 gallon tank should suffice.

As with other crab species, fiddler crabs are susceptible to disease; however, most health issues they experience in captivity are often due to poor living conditions. To ensure your fiddler stays healthy in captivity, maintain an environment free from parasites by changing out about 20% of its water weekly; also monitor his shell condition for signs of damage caused by fungus growth or missing feet/claws that indicate potential health problems.

Fiddler crabs in the wild can be classified by the width of their eyestalks; those with close-together eyestalks belong to Genus Uca while those with wider ones belong to Minuca or Leptuca genera.


Fiddler crabs are an excellent pet option for anyone who’s looking to add something fun and interactive into their home environment. Like all pets, however, fiddler crabs require specific care requirements in order to thrive under captivity – but don’t worry, fiddler crabs are relatively simple creatures to care for as long as you address their main issues.

Make sure you purchase an aquarium large enough for housing fiddler crabs, as these crustaceans require room to burrow. Six to eight crabs should fit comfortably into a 10 gallon or larger tank; additionally, consider investing in an escape-proof aquarium or container with an securely locking lid to further ensure their wellbeing.

Fiddler crab aquariums must include plenty of sand for them to dig around in and rest on, along with filters and heaters to maintain clean, warm water that’s comfortable for them to swim around in. You should also add decorations such as plastic plants, live aquarium plants, driftwood or any other items to add variety and enrich their environment.

Handling crabs should only be done sparingly or not at all; their stress from being handled is high and they could lash out if they feel threatened or endangered. Also, do not touch or hold one during its molting process, which can last weeks and make the animal appear lifeless; leave its exoskeleton in its aquarium as your crab will likely consume it as a calcium source.


Ferrets are affectionate, playful animals that make great companions. Unfortunately, however, they’re susceptible to several serious conditions that are difficult to treat, such as insulinoma and adrenal disease – both require treatment with antibiotics on an ongoing basis in order to prevent death – while Revolution (selamectin) should also be administered monthly as preventative measure against heartworm disease in dogs.

Fiddler crabs require brackish water, a mixture of part saltwater and part freshwater, for optimal living conditions. Their tank should hold at least five gallons of this brackish mixture which should be created by mixing tap water that has been left sitting out for 24 hours with spring or distilled water, then adding table salt until its specific gravity reaches between 1.005-1.10 for optimal performance.

Provide the crabs with a sandy substrate and larger rocks or pieces of driftwood, along with gravel or crushed shells as these may injure their fragile bodies when trying to burrow through. Also ensure there is enough water cover – at least several inches should do.

The tank should contain plants and decorations to provide shelter for crabs during times of molting or fear, plastic plants are preferable as crabs could destroy live ones. You could also add PVC pipes for climbing purposes and as hiding places.


Turtles such as Plecostomus pond- and river-style turtles can co-habitate peacefully with fiddler crabs provided there is enough sand in their environment for climbing out of the water. Warm-water species such as this prefer shallow waters with slow current that allow ample sunlight for basking. Incorporating rocks, driftwood or artificial or real plants into their environment provides further climbing surfaces for these aquatic reptiles.

Fiddler crabs feed on algae, bacteria and decaying marsh plant matter found buried within sand or mud. Fiddler crabs get their name from male fiddler crabs’ large claw which resembles a fiddle; males signal females they’re ready for mating by waving this claw before waving it in front of her face; they mate every two weeks during summer before the male burrows down underground to plug his entrance and return home afterwards.

Fiddler crabs require an environment consisting of both freshwater and brackish water – approximately 75% to 85% saltwater – that can be replicated using aquarium water conditioner (found at most pet stores) along with enough aquarium salt to mimic what would be found in their natural habitat. The specific gravity should range between 1.05-1.01; this can be easily tested using hydrometers available from fish departments at pet stores.