The tail spot difference is true in many other cichlids. beside uropthalmus.
In most central American cichlids the caudal spot is centered , as in the Nosferatu pantostictus below
The tail spot in festae and many other S Americans is not centered but encompasses the upper part, as in the festae below.
But not only festae.
Note the tail spot in the S American Australoheros below
or the Mesoheros gephyrum below
but below another example of a Central American
Amatitlania cutteri
or below Parachromis motaguense
and more to the point below, Mayaheros uropthalmus in nature.
Azul imovie edit