I haven't decide yet if I'm going to get a Randall pistol or even keep the yasha, but their relationship are cool. I'm still researching to see what's the risk of the pistol harming my pair of baby mandarin. tank is only 14 gallon and I don't use a cover either so there's also risk of the yasha jumping out. Yasha's in QT so I have 7 more weeks to decide haha.
I have a yasha goby / candy cane pistol pair... they were great in my 22gal, a little less great once i moved them to my 65gal... you never really know where they're going to setup shop and sometime that means rarely seeing them... food for thought when you throw them into your 100