Emerald Crab (Mithraculus sculptus)
The Emerald Crab (Mithraculus sculptus) is a popular and highly useful addition to marine reef aquariums, prized for its ability to control nuisance algae while adding interesting behaviour to the aquarium. Recognisable by its vibrant green shell and flat, spoon-shaped claws, this hardworking crab plays an important role in many clean-up crews.
 
Algae Control & Aquarium Benefits
Emerald Crabs are particularly well known for their ability to graze on bubble algae (Valonia), making them a valuable natural solution for managing this common reef aquarium nuisance. In addition to bubble algae, they will also consume film algae, leftover food and detritus, helping to maintain a cleaner and healthier aquarium environment.
 
Behaviour & Compatibility
Mithraculus sculptus are generally considered reef safe when well fed and kept in balanced systems. They spend much of their time exploring rockwork and crevices in search of algae and food, making them both useful and interesting to observe.
Providing a varied diet and stable water conditions helps ensure peaceful behaviour and good health.
 
Care Requirements
Emerald Crabs thrive in stable marine aquariums with plenty of live rock where they can graze and hide. Like most clean-up crew members, they are hardy and adapt well to established reef systems.
 
Key Benefits
• Excellent natural control of bubble algae
• Consumes nuisance algae, detritus and leftover food
• Hardy and adaptable reef invertebrate
• Interesting and active addition to the aquarium
 
Summary
With their distinctive appearance and valuable algae-grazing abilities, Emerald Crabs are a highly beneficial member of any marine aquarium clean-up crew, helping maintain a balanced and healthy reef environment.