goby/shrimp relationship

[Invigor]

i've got a yellow watchman goby and I thought if I could get him a little buddy, it'd be cool. He's kind of an outcast and only comes out whenever there's food.

from what i've been reading, I'm looking for a pistol shrimp, but I also read there are different kinds of pistol shrimp.

does anyone have a bonded pair? what kind of goby and what kind of shrimp do you have, how did you introduce them both to your tank? one before the other/together?

thanks.