Georgette Douwma / Coral reef scenery with a pair of Red Sea raccoon butterflyfish (Chaetodon fasciatus), Pygmy sweepers (Parapriacanthus guentheri) and soft corals (Dendronephthya sp) Egypt, Red Sea.

Franco Banfi / Shoaling glassfish (Parapriacanthus sp.) shoal, Maldives, Indian Ocean

Georgette Douwma / Emperor angelfish (Pomacanthus imperator) with soft corals and sweepers. Egypt, Red Sea.

Juergen Freund / Schooling Yellow-ribbon sweetlips (Plectorhinchus polytaenia) surrounded by glassy sweepers (Pempheris schomburgki). North Raja Ampat, West Papua, Indonesia

Juergen Freund / Yellow-ribbon sweetlips (Plectorhinchus polytaenia) surrounded by dense shoal of glassy sweepers (Pempheris schomburgki). North Raja Ampat, West Papua, Indonesia

Georgette Douwma / Coral reef scenery with Gorgonian and shoal of Pygmy / Glassy sweepers (Parapriacanthus guentheri) Egypt, Red Sea

Georgette Douwma / Elongate surgeonfish (Acanthurus mata) at a cleaning station with Bluestreak cleaner wrasses and sweepers in the background. Andaman Sea, Thailand

Georgette Douwma / Shoal of pygmy sweepers (Parapriacanthus ransonetti), Andaman Sea, Thailand

Dan Burton / Glassy sweepers {Parapriacanthus guentheri} on coral reef, Red Sea, Egypt

Georgette Douwma / Kaleidoscopic image of Pygmy sweepers (Parapriacanthus guentheri) and soft corals (Dendronephthia sp.), Egypt, Red Sea.

Georgette Douwma / Kaleidoscopic image of Pygmy sweepers (Parapriacanthus guentheri) with soft corals (Dendronephthia sp.), Egypt, Red sea.

Pascal Kobeh / Harlequin sweetlips (Plectorhinchus chaetodonoides) and school of Yellow sweepers (Parapriacanthus ransonneti). On reef covered with Soft coral (Dendronephthya sp). Flores Sea, Indonesia.