Pistol shrimp *Advice

[RealReef7]

So i added 2 bullseye pistol shrimp 2 years ago about 1/2" and i've never seen them but today when i was doing some sump cleaning i looked up and to my surprise i see 2 giant 2 1/2" - 3" bullseye pistol shrimp.. 1 following the other. Is it possible that i have a "pair" of bullseye pistol shrimp? Another question.. is there anyway i can somehow make these guys come out? I have a shrimp goby in there right now but its hosted with a regular pink pistol shrimp.

[dread240]

Aside from them paired up with a goby, I've never had luck with seeing a pistol shrimp. I've had a tiger pistol for over a year, rarely saw, once in a blue moon while feeding. Last night I put a yellow watchman goby in the tank from a friend that was tearing his tank down, paired in 5 minutes flat and the pistol is constantly seen now with him.