its similar to a nassarius but its not. the shell is too shiny. it is a very benificial fast breeding algae eating snail that for some reason I just cant remember the name of I have hundreds in my tank and give them away to friends and pet stores. this snail does not dive in the sand but cleans surfaces the small bite pattern of the mouth is good for cleaning and it can fit into small crevices for cleaning and does not get big enough to "bulldoze" and knock stuff over. why cant I remember the name? curse my rotten memory.