Birgitte Wilms / Sponge (Xestospongia sp) and Bannerfish (Heniochus diphreutes) pair, Solomon Islands

Doug Perrine / Schooling bannerfish / False moorish idol (Heniochus diphreutes) shoal swimming in front of Neon Cave, off Kauai, Hawaii, Pacific Ocean.

Doug Perrine / Schooling bannerfish / False moorish idol (Heniochus diphreutes) juvenile, cleaning a Threadfin butterflyfish (Chaetodon auriga), North Kona, Hawaii, Pacific Ocean.

Doug Perrine / Two Pennant butterflyfish / False moorish idols (Heniochus diphreutes) juveniles, swimming over seabed, North Kona, Hawaii, Pacific Ocean.

Doug Perrine / Pennant butterflyfish / False moorish idol (Heniochus diphreutes) swimming over coral reef with Hawaiian dascyllus (Dascyllus ablisella) and juvenile Bluestripe snappers (Lutjanus kasmira), surrounded...

Alex Mustard / Schooling Bannerfish (Heniochus diphreutes) and Yellowback fusiliers (Caesio xanthonota) diving down close to the coral reef as predators approach, North Ari Atoll, Maldives. Indian Ocean.

David Fleetham / Coral reef with Slate pencil sea urchins (Heterocentrotus mammillatus), Pennantfish (Heniochus diphreutes) and Pyramid butterflyfish (Hemitaurichthys polylepis) and a diver holding a light, Hawaii. Mo...

David Fleetham / Slate pencil sea urchins (Heterocentrotus mammillatus) Pennantfish (Heniochus diphreutes) and Pyramid butterflyfish, (Hemitaurichthys polylepis) swim through the background. Hawaii.