It would be really cool to include this great odd couple in the creatures pack for MA3. This Threadfin goby and Pistol Shrimp live together in the same hole. The shrimp is always at work on remodeling the home; and since he is blind, he relies on the goby to watch his back. They work so great together and are a joy to watch.
http://www.astec.ac.uk/staff/goudket/Reefgallery/yellownose.htm