I've always admired what they call a Dragon goby or Banded goby. Done alot of research on them at one time. What it boiled down to for me was that it was a sand sifter, I'd watch them at my LFS all the time taking mouth fulls of sand and sifting them through their gills. I still think they are a magnificant fish.
However as a sandsifter he will be eating alot of your small inverts in the sandbed. I didn't want that to happen to mine. I have hopes of soon adding a mandarin to my system and I didn't want a sandsifter depleting the sandbed of my pods, not to mention many other micro infauna. Thats why I didn't get one.
Thomas