Like everyone said you should see them plenty. When I set up my 120 I made a network of pvc tunnels with three entrances, all at optimal viewing points. I then placed my pistol in one of the entrances, an hour later the goby found him and one year later they still live in the tunnels. I have done this in my last two tanks and it works very very well. First off the shrimp only digs at the tunnel entrances and never risks toppling over rocks plus the pair is always where you can see them, front and center! Dont worry about an eye sore either because after awhile the shrimp piles said over the entrance so no one can even tell there is a pvc pipe right there.