feather duster worm, popular and demanding pet move tentacles in circular current and hunt for food, healthy active bristleworm

active aggregation animal 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 funny hardscape healthy hunt lateral life macro marine mediterranean motion move nano nature peaceful pet pico polychaeta polyp popular reef relax sabellidae salt saltwater sea tank tentacles tropical undersea understanding underwater viola widespread wildlife worm