These Cerith snails are from the eastern Pacific around the Baja California. They are found on muddy grass beds where they help to keep slime and nuisance algae off of the sea grasses. They will spend time on your substrate nibbling on detritus, or they will be found crawling up the glass or plants and rocks searching for algae. It is reported that they will consume diatoms. It takes quite a few of them to put a dent in rapidly growing algae outbreaks. They make excellent nano inhabitants.