Only use Nix if you can't get PAM. Nix is the same stuff, basically, but not dosed for snakes. You can get a can of pam, and some nix, and figure out how to dilute the nix to the same strength then follow the pam directions for applying the nix. You save money, but you should only do this if you have experience mixing things, and already know how to use Pam. The cost of pam is higher than nix and it is harder to get, but I recommend it over nix, since it is easier to use and has instructions for treating snakes.
David