While alluring due to their attractive coloration, Bumble Bee snails (Engina mendicaria) (Pusiostoma mendicaria) are not the best choice for the tropical marine aquarium with a deep sand bed. The reason for this is that Bumble Bee snails are carnivores and will prey on beneficial fauna in the sand bed. There is also some anecdotal evidence that they will feed on zooanthids and polyps.
for a rare zoa tank its not worth the risk. IMO