agree. also the pattern contrast (for species such as P. endlicheri endlicheri) will also change somewhat as the fish age/mature. And as said, substrate color can affect the color and pattern contrast. dark substrate makes the color dark, white or light substrate washes out the color. For species such as endlicheri and lapradei, the best color substrate is actually red, which can bring out the patterns giving them a great contrast against the base color of the fish.