Fiddler crab

Fiddler crabs are captivating semi-aquatic crustaceans renowned for their distinctive asymmetrical claws—males display one dramatically enlarged claw used for signaling and territorial displays. These hardy, social creatures thrive in brackish or saltwater setups with shallow water zones and sandy substrates where they can burrow and forage. They're relatively low-maintenance, feeding on detritus, algae, and supplemental foods, making them ideal for intermediate aquarists seeking an engaging, interactive species. Fiddler crabs exhibit fascinating behavioral patterns and can live 2–3 years with proper care, stable salinity, and adequate hiding spaces.