Notes: These hard tube coco worms secretes a calcareous tube approximately ½ inch in diameter and 5-8 long. The tubes come bent in all sorts of shapes. All Coco Worms require proper calcium levels of 400-450 ppm in order to grow their tubes.
Coco worms use their radioles, or crowns, to filter bacteria and particulate matter from the water. When disturbed the Coco Worm can retract quickly into its tube and close its operculum to shut the top of its tube for safety.
When placing Coco Worms in the aquarium you may bury them in the sand with the crown end of the tube protruding from the sand, or stick them in a hole in the rocks with the crown end facing outward. If they are retracted and you dont know which end is which lay them on the sand bed until they open and then place them into position.
Although Coco Worms subsist mainly on bacteria and organic matter produced within the aquarium they will benefit from supplemental feedings of marine snow, phytoplankton, and/or foods for filter feeders.