The Campfire Feather Duster (Sabellastarta sp.) also known as the Fan Worm, is a marine segmented worm that attaches its calcium-carbonate tube to a rocky or sandy substrate by its base. The worm lives inside this protective tube and has feather like feeder tentacles that are red and yellow resembling a campfire hence the name. They then have a feathery crown that peeks out filtering the water column for food using its specialized tentacles. Their tentacles are completely retractable and can be fascinating to watch open and close. Being  a Filter feeder it's best to have them in a  aged saltwater tank and have it be at least 10 gallons.