Echinothrix calamaris, commonly known as the small banded sea urchin, is a captivating addition to mature marine aquariums. Recognisable by its long black spines marked with white bands, this species offers both aesthetic appeal and functional benefits, particularly in algae management.
Care Level: Moderate care is recommended due to its sensitivity to water quality and specific dietary needs.
Diet: Primarily herbivorous, Echinothrix calamaris grazes on various types of algae, helping to maintain a balanced ecosystem. Supplement feeding with dried seaweed or specialised herbivore pellets is advised if natural algae is insufficient.
Compatibility & Reef Safety: Generally reef safe, this urchin coexists well with most invertebrates and fish. However, caution is advised around slow-moving or delicate coral species, as the urchin’s spines can cause damage if contact occurs.
Tank Requirements: A minimum tank size of 75 litres is recommended to provide adequate space and stable water parameters. Moderate water flow and lighting conditions that support algae growth will contribute to the urchin’s health and activity.
Placement: Position the urchin on live rock or substrate where algae growth is present. Avoid placing near aggressive tank mates or areas with strong currents that may stress the animal.
Origin: Not Provided.
Maximum Size: Typically grows up to 10 cm in diameter.



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