Yellow face jaw fish, I have one and he's plowing through my sand and my orange spotted goby has made some pretty awesome underground tunnels. The jaw fish is just amazing to watch.
Here's my jaw fish
And here's my orange spotted goby
**Just make sure your rock work is down to the bottom of the tank. Put your rocks in first then the sand. Once these guys start tunneling through your tank if the rocks are unstable it could cause some major issues. My buddy had a tank bottom crack because he put sand first then rock. Just a little helpful tip.
Also these guys are in my BC29
Oh and there are snails that hide in the sand and pop out when you feed so they would be stirring up the sand as well. And then you have sand sifting star fish. All are reef safe.