Sea urchins are often used to keep various algae at bay.
They are very effective algae eaters, and will eat anything from coralline algae to green hair algae. Sea urchins must not be kept in an aquarium with few algae, as they may starve to death.
Sea urchins should be acclimatized slowly, due to sensitivity towards changes in salinity.
Fire urchinAsthenosoma varium
Long-spined sea urchinDiadema setosum
Banded sea urchinEchinothrix calamaris
Pencil urchinHeterocentrotus mammillatus
Tuxedo UrchinMespilia globulus
Sea eggTripneustes ventricosus
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