When u have a group of schooling fish it doesnt really matter what color they are. It is amazing when their little bodies turn in sync with each other. With a tank that size I would suggest getting your favorites in the bright colors then the rest should be a silver, black, white or stripes. The bright ones will stank out among the crowd. If you keep all you plants the same color the Bright Fishies color will POP. Glad to here your doing research. After all the happiness and health of the fish is more important than their fashion.