Just from reading other posts, I think the tiny tangs have a higher mortality rate, especially the blue tang. Having said that, I'm not sure why. Do a search and see if you find what I'm talking about. I'm sure I read that in several different posts. I got my first yellow at about 3 1/2 inches from nose to the base of his tail. Pretty small, but big enough to be eating good and holding his own. That was almost a year ago.