I got a 7 and half inches long engineer goby for sale or for trade, $10 or any ric frag or Zoa frag would work.
I can't really take a picture of it since it always "rebuilding" my tank.
Please have at least 60 to 75g to keep this guy cuz its size and make sure you have secure rock base.
Exact same looking as the one in this youtube
http://www.youtube.com/watch?v=rk3Um0HxVek