Capturing a pistol shrimp

so i got this pistol shrimp a few weeks ago in the hopes that he would pair up with my yellow watchman. he hasn't . and to make matters worse he seems really aggressive since the yellow watchman is always on the side of the tank and not in his usual spot (near one of the pistols burrow entrances). so i would like to take him out and try with a tiger pistol. anyone got any ideas on how to catch him? he never comes out unless theres food and even then hes really timid when i move.
thanks.

 

they are really tough to get out. If hes small enough you might be able to syphon him but make sure its a big enough tube