I have a single pearly jawfish that has been doing well for several months now. It lives in a frag rack that I buried in the sand which it has dugout underneath. There are several holes to poke in and out of, and presumably a lot of space underneath (I have a deep sandbed and its a large frag...
I don’t know if this is a common occurrence but I noticed my white ribbon eel and pearly Jawfish sharing a burrow today. They seem to be very comfortable living together. Below is a short video I took. Sorry the tank is not looking it’s cleanest at the moment.