I posted a couple weeks ago that I had 5 amamo shrimp that were 2 years old. Well, I guess the generally regarded life span of 2 years is pretty accurate as I have lost 2 in a little over a week now. I just went back and found the post from April 19, 2005 where I had bought them the previousl day. I got 6 originally and lost one the first night but the other 5 have done great until now. I guess I will have to start over again with the ones so small you can't see them. I can't imagine a tank without shrimp.