Diadema setosum | S

Diadema setosum is a visually captivating sea urchin species prized in marine aquariums for its elegant, long black spines with white bands and a bright orange ring around its mouth. This small-sized urchin is an excellent addition to mature reef tanks, where it contributes to natural algae control and adds dynamic movement.

Care and Husbandry: Diadema setosum requires a well-established aquarium with stable water parameters and plenty of live rock for grazing. It is primarily nocturnal and feeds on algae and detritus, so supplementing its diet with dried seaweed or specialised invertebrate foods is recommended to maintain health.

Compatibility and Reef Safety: This species is generally reef safe but should be housed with caution around slow-moving or delicate invertebrates and fish, as its long spines can cause injury. Avoid keeping it with aggressive predators such as triggerfish or pufferfish.

Tank Requirements: A minimum tank size of 75 litres is advised to provide adequate space and stable water conditions. Moderate water flow and low to moderate lighting suit its natural habitat preferences. Placement should allow access to algae-covered surfaces while providing shelter during daylight hours.

With proper care, Diadema setosum can thrive and become a fascinating, functional member of your marine aquarium community.