My beautiful little randalls pistol shrimp has been missing for about three months. I assumed dead from when I moved rocks around, or a fish, or crab made a meal of him.
But whenever I go into my tank and clean I will notice small holes dug into the sand under my rocks, so I started closeing them up when I vacuum the sand.
That night if I go in after all the lights have been off for an hour or so, I can shine a red flashlight in the and see him re-digging the holes.
When my pistole was paired up with my watchman goby, you would see him all the time, like the took turns watching the opening to thier cave/home.
But when they went thier own ways awhile back, I rarely see the shrimp.