Somewhat ironically I have very few images of H. diphreutus, and none that are worth sharing.  This species is called the Schooling Bannerfish.  It has two much more well-defined …

A Hilton’s aeolid nudibranch sea slug (Phidiana hiltoni) patrols the understory of invertebrates and red algae covering the Cannery Row reefs just off the back deck of the Aquarium. …