Box or Sundial snails - Polyp eaters

These snails can be found on different types of polyps like Zoanthus, Palythoa and Protopalythoa. They feed on polyps, by sucking out polyp's fluids. If left in the tank they can ruin polyp colonies. I advise to take them out as soon you spot them. It is easy to remove Sundial snails manually. Inspect newly purchased coral colonies before introducing them to the tank.