Eucidaris spp. are medium-sized sea urchins known for their distinctive spiny appearance and hardy nature, making them a popular choice for marine aquarium hobbyists. These urchins are generally reef safe but should be introduced with caution due to their grazing habits.
Care Level: Moderate care is recommended. They require stable water parameters and regular feeding to thrive.
Diet: Eucidaris spp. are omnivorous grazers. Their diet should include algae, detritus, and supplemental feeding with seaweed or specialised invertebrate foods to maintain health.
Compatibility: Generally compatible with most reef inhabitants, but care should be taken as they may graze on softer corals or sessile invertebrates. Avoid housing with aggressive tank mates that may harm them.
Tank Requirements: A minimum tank size of 75 litres is recommended to provide adequate space and stable water conditions. Moderate water flow and lighting are suitable, mimicking their natural reef environment.
Placement: Place on live rock or substrate where they can graze freely. Ensure hiding places are available to reduce stress.
Origin & Size: Origin and maximum size vary among species within the genus; therefore, conservative husbandry practices are advised.



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