If my research did me right,they are also called margarita snails correct?I use stomatella snails now (got sick and tired of flipping snails) plus they reproduce in my tank year-round so I have a never ending supply and they do just as good a job as the astraea ever did. No hermits because of above reason and you can train the shrimp to ride your arm and eat from your hand which I find very cool, I call mine Clifford (Fire shrimp so red puppy)