I'd get a jawfish in a heartbeat if I could deal with a 4" sand / rubble bed in my tank.
+1 on the screen top. The brs kit is good, you can also make it yourself a little cheaper out of a screen frame and bird netting from homedepot. I've even heard off fish getting through the 1/4" mesh, but it seems much less likely. Very careful reefers will double up the mesh so the holes are a bit smaller. The 1/4" stuff is what almost everyone uses though