My uncle recently passed away and I have taken over many of his fish, however there are some that I am not sure of, perhaps someone will know what kind of sword this is.
It does look like what the trade called a green sword when I was a kid. Some varieties of X helleri look that same way when they are young although many of the sources of X helleri have black spots on the body. The collection point seems to affect how much color is seen on the body of an X helleri. Some are as pure green looking as that one.