DIADEMA SETOSUM - DIADEM SEA URCHIN
 A beautiful, long-spined sea urchin that is very easy to keep . It is a little shy at first and is then only active at night, but this changes over time. As the diadem sea urchin grows very large very quickly (max. 35-50 cm ), it should only be kept in large tanks of 1500 liters or more . It feeds exclusively on algae.