Well, I can't really say that I know that, becuase I gave them to my cousin, becuase she had a special little tank for them. They lived with me for at least 2 or so weeks. And I haven't heard about them from my cousin..who knows..they could still be alive. But that was like 2 years ago..so i really don't know. But I think that they are a great invesment, they're so small and cute, and I spent a lot of time just sitting there watching them, they're great!