Pincushion Urchin (Lytechinus variegatus)
The Pincushion Urchin is one of the most popular and effective algae-grazing invertebrates for saltwater aquariums. Recognized by its rounded body covered in short, colorful spines, this hardworking echinoderm helps keep live rock, aquarium glass, and other surfaces free of nuisance algae. Available in a variety of colors, including purple, pink, green, and white, the Pincushion Urchin adds both beauty and function to reef aquariums.
Native to the tropical waters of the Caribbean and Western Atlantic, the Pincushion Urchin spends its day slowly grazing on film algae, hair algae, and other natural growth. It is also known for carrying shells, coral rubble, and other small objects on its spines as camouflage, creating fascinating behavior that makes it an entertaining addition to any marine aquarium.
Pincushion Urchins thrive in mature reef aquariums with stable water chemistry and plenty of live rock to graze. As natural algae become depleted, they should be supplemented with dried seaweed (nori) or other algae-based foods to ensure long-term health. Because they are surprisingly strong, they may occasionally dislodge unsecured coral frags or lightweight decorations while moving throughout the aquarium.
The Pincushion Urchin is considered reef safe and is an excellent member of a reef clean-up crew. It is peaceful with corals and fish but should not be kept with predators such as large triggerfish, puffers, or other animals that may prey on sea urchins.
Scientific Name: Lytechinus variegatus
Common Name: Pincushion Urchin
Care Level: Easy to Moderate
Temperament: Peaceful
Diet: Herbivore
Reef Safe: Yes
Adult Size: Up to 4 Inches
Minimum Tank Size: 30 Gallons
Origin: Caribbean & Western Atlantic
If you're looking for a reliable, reef-safe algae grazer that also adds unique character to your aquarium, the Pincushion Urchin is an outstanding choice. Its peaceful nature, colorful appearance, and constant grazing make it a valuable addition to reef tanks of all sizes.
