I just moved from 29 gallon (set up before I got the jawfish) to a 65 gal. I was always afraid that he'd cause an avalanche and get hurt, so I set up the 65 g with 2 sets of PVC rectangles, and one wiggly PVC "P" trap pipe, with "T"s as entrances. I put all live rock either directly on the glass or on top of the PVC so that they couldn't fall if/when he tunneled.
3 beautiful jawfish tunnels and the little SOB takes up residents right next to one! Check him out. Look immediately to the right of his tunnel and you'll see the entrance to the PVC tunnel. They certainly have minds of their own! "Dozer" in his new burrow... - YouTube
3 beautiful jawfish tunnels and the little SOB takes up residents right next to one! Check him out. Look immediately to the right of his tunnel and you'll see the entrance to the PVC tunnel. They certainly have minds of their own! "Dozer" in his new burrow... - YouTube