How big is your tank? The bigger the tank the harder it will be for them to notice eachother.
I got a Yasha goby a few weeks before the pistol shrimp. I put the shrimp as near to the yasha as a could. It took about a day before they became a trio! It's interesting to watch, i never see more than 2 of them at a time. If my yasha is out then one shrimp is out and if another shrimp tries to come out the yasha pushes him back in. Then if more than one shimp is out the other shrimp pushes him back in.
It's funny to watch.
Hope this helps
SeaSerpant
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