Nucella feeds in harmony on their rocky mid and high intertidal grounds. You hardly ever find a loner. Harmony in Nucella, however, means a sight of wreckage for acorn barnacles, Balanus glandula. Nucella drills into the shell and eats the barnacle within.
It may be a breach of etiquette to post a violent predator-prey scene in a harmony-themed challenge, but from the Nucella point of view I see harmony.