Morgan,
I have been using my past salt tank experience to look for fish that are either rare, to difficult, to expensive, or unusual for the average enthusist to keep. In the unusual category, you might consider the Yellowheaded Jawfish. I don't know if Jim would consider this an actual "fish" choice or something in the "bottom dwellers" category. This particular fish burrows in the sand or shells on the bottom of the tank and makes its home there. It swims around rarely, mostly it hovers right above the opening to its lair in a vertical position, and if startled will dart backwards into its hole. Info can be found at this site --
www.petwhse2.com/gillsgro...awfish.asp
and a picture at this one --
www.seasaba.com/photos/jawfish.html