the only bad thing is i wondering what to do if the goby or shrimp every dies because they are the best of friends.
My goby has been in the tank for more than ten years and is on his second shrimp. I'm not sure why the first shrimp croaked but the goby bonded with the new one right away. Apparently gobies aren't sentimental...
As for other shrimp... I've tried cleaner shrimp and they last a few months (up to a year) then disappear. I don't think the pistol had anything to do with it. The only scenario I would see problems with a pistol and any other shrimp is if the other shrimp tried to take up residence in the pistol's cave(s). Cleaners are probably the least likely to do that with scarlet/bloods most likely and peppermints somewhere in between. JMO.
iyachtuxivm - Sorry if I misunderstood your earlier post. Sounds like we experience similar issues with tunnel building.