I have a pistol shrimp/yellow watchman goby and they are great together. I also have two cleaners, two pepermints, one coral banded, and one fire shrimp. No problems with any of them.
WOW! There you go then. I see to that Lando has a 72g and you have a 75g. So, sounds like the odds are for you.
I have a Coral Banded, and 3 Peppermints, in a 75g, and they are all fine. I plan on getting some cleaners, and NOW some fire shrimp.