Are you talking about the bluespot watchman thats kind of goldish looking?
can a tiger shrimp be dangerous to my other shrimps (sexy, cleaner, red)?
possibly but not likely. I had a pistol in with 4 peppermints, 1 scarlet cleaner, and 1 fire red cleaner. Never had a problem.... well, until I introduced a mystery wrasse that is but that's another story. :hmm2:
Make sure you have adequate distance between the two gobies, they will jaw at each other if either encroaches on the others territory, it is amusing to watch how big their mouths get when quarreling
Edit: Where did you pick up the Tiger Pistol at, if I may ask?
What about the yellow watchman?