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Care see Salmacis bicolor ... Sea urchins need seaweed as food to survive long term in an aquarium. This may be as follows: periphyton algae, coralline algae, but also higher algae. If you have a problem with Caulerpa species (C. taxifolia here in particular) in your aquarium, just in this case Salmacis sphaeroides is a "predator" par excellence.
Classification: Biota > Animalia (Kingdom) > Echinodermata (Phylum) > Echinozoa (Subphylum) > Echinoidea (Class) > Euechinoidea (Subclass) >Carinacea (Infraclass) > Echinacea (Superorder) > Camarodonta (Order) > Temnopleuridea (Infraorder) >Temnopleuridae (Family)
Classification: Biota > Animalia (Kingdom) > Echinodermata (Phylum) > Echinozoa (Subphylum) > Echinoidea (Class) > Euechinoidea (Subclass) >Carinacea (Infraclass) > Echinacea (Superorder) > Camarodonta (Order) > Temnopleuridea (Infraorder) >Temnopleuridae (Family)