feather duster worm and soft coral, popular and demanding pet move tentacles in circular current and hunt for food

active aggregation animals aquaculture aquarium aquascape aquatic biocenosis biodiversity biology bispira bristleworm captive chumminess circular colorful commensal community conditions controlled coral coralimorph cultivation current decorative demanding duster easytokeep ecosystem environment exotic explore farm fauna feather flow food hardscape healthy hunt lateral life macro marine mediterranean motion move nano nature peaceful pet pico polychaeta polyp popular reef relax sabellidae salt saltwater sea soft tank tentacles tropical undersea understanding underwater viola widespread wildlife worm