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.

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.

Georgette Douwma / Pygmy sweepers (Parapriacanthus ransonetti). West Papua, Indonesia. Indo-West Pacific.

David Fleetham / Gorgonian, alconarian coral and schooling Pygmy sweepers (Parapriacanthus ransonneti) Indonesia.

Linda Pitkin / School of Golden/ Pygmy Sweepers (Parapriacanthus ransonneti), and other fishes, sheltering around a coral head Dampier Strait, Raja Ampat, West Papua, Indonesia.

Linda Pitkin / School of Golden/ Pygmy Sweepers (Parapriacanthus ransonneti), and other fishes, sheltering around a coral head Dampier Strait, Raja Ampat, West Papua, Indonesia, March 2016

Bertie Gregory / School of Glassfish (Parapriacanthus guentheri) in the cargo hold of the SS Ulysses, Gubal Island, northern Red Sea.

Georgette Douwma / Pygmy sweepers (Parapriacanthus ransonetti) with a Gorgonian sea fan (Melithaea sp.) and soft corals (Dendronephthya sp) Similan Islands, Andaman Sea, Thailand.

Georgette Douwma / Coral reef with soft corals (Dendronephthya sp.), encrusting sponges and Pygmy sweepers (Parapriacanthus ransonetti) Similan Islands, Andaman Sea, Thailand.

Georgette Douwma / Lionfish (Pterois volitans) hunting Pygmy sweepers (Parapriacanthus ransonetti) Similian Islands, Andaman Sea, Thailand.

Georgette Douwma / Gorgonian sea fans (Melithaea sp.) with a large school of Pygmy sweepers (Parapriacanthus ransonetti) Andaman Sea, Thailand.