Diadema setosum common name: Long-spined sea urchin. This sea urchin is nocturnal and often hides during the day. It is a real asset against algae. It almost never bothers the corals except juvenile corals, which can be threatened during its grazing.
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Diadema setosum, better known as the diadem urchin, is a formidable nocturnal echinoderm against algae. This specimen, native to tropical reefs, is highly valued for its ability to graze unwanted algae on live rocks, decorations, and hard-to-reach areas of the reef tank.
The diadem urchin is distinguished by its extremely long spines, which can bring its total size up to 40 cm. Naturally discreet, it hides during the day and becomes active at night, making its action effective without disturbing the tank's life during lighting hours.
Although it does not damage adult corals, it can sometimes disturb or displace juvenile or freshly settled corals during its movements. It is therefore advisable to secure the cuttings well and monitor during the first days of introduction.
Diadema setosum is a valuable ally against unwanted algae. Thanks to its spectacular spines and nocturnal efficiency, it ensures a natural regulation of the microflora while adding a wild touch to your reef decor.