A good friend of mine Dr Mike Pauers has been studying how cichlids see, here is a paper published by Mike and his colleagues you all might find interesting.
http://journal.frontiersin.org/arti...=Frontiers_in_Ecology_and_Evolution&id=179528
http://journal.frontiersin.org/arti...=Frontiers_in_Ecology_and_Evolution&id=179528