bispira bristleworm move tentacles in circular current, hunt for food, popular pet in coral substrate bottom, funny active animals

aquaculture aquascape aquatic biocenosis biodiversity biology bispira brunnea captive caribbean cluster colonial colony colorful commensal community conditions controlled coral cultivation decorative duster easytokeep ecosystem environment exotic farm fauna feather flow hardscape hermaphrodite lateral macro motion nature noncalcareous peaceful pico planktivore plankton radiole reef relax sabellidae salt saltwater sediment social tank tropical tube undersea understanding underwater widespread wildlife