Coral Reef with Barrel Sponge, Xestospongia testudinaria, Kai Islands, Moluccas, Indonesia

Coral reef with Barrel Sponge, Xestospongia testudinaria, Raja Ampat, West Papua, Indonesia

Shoal of Neon Fusilier, Pterocaesio tile, Kai Islands, Moluccas, Indonesia

Coral Crab inside sponge, Trapezia sp., Ambon, Moluccas, Indonesia

Coral Crab inside sponge, Trapezia sp., Ambon, Moluccas, Indonesia

Divers hovering above a large pink barrel sponge, Indonesia.

Underwater photographer at the entrance of a cave framed by pink barrel sponges, North Sulawesi, Indonesia.

Scorpianfish (Scorpaenopsis oxycephalus), inside barrel sponge (Xestospongia testudinaria), Amed, Bali, Indonesia, Southeast Asia, Asia

Grouper (Cephalopholis sp.) inside barrel sponge (Xestospongia testudinaria), Amed, Bali, Indonesia, Southeast Asia, Asia

Sea cucumbers (Synaptula sp.) on giant barrel sponge (Xestospongia testudinaria), Dumaguete, Negros Island, Philippines, Southeast Asia, Asia

Thousands of scalefin anthias (Pseudanthias squamipinnis), hovering over corals and barrel sponge, Puerto Galera, Mindoro, Philippines, Southeast Asia, Asia

Sea cucumbers (Synaptula sp.) on giant barrel sponge (Xestospongia testudinaria), Dumaguete, Negros Island, Philippines, Southeast Asia, Asia

Thousands of scalefin anthias, Pseudanthias squamipinnis, hover over corals and barrel sponge, Puerto Galera, Mindoro, Philippines.

Sabre squirrelfish;Sargocentron spiniferum) having found refuge in a huge barrel sponge;Xestospongia testudinaria) at the mouth of the S-shaped pass at a depth of 50 meters. Mayotte