A white-v hydroid crab (Hyastenus borradailei), feeding on a colony of green tube coral, Fiji, South Pacific, Pacific

Cave coral (Tubastrea sp.) (Dendrophyllidae) polyps extended and feeding at night, Queensland, Australia, Pacific

Yellow (Tubastrea faulkneri) coral polyps, Southern Thailand, Andaman Sea, Indian Ocean, Asia

Reef of Orange Cup Corals, Tubastrea coccinea, Triton Bay, West Papua, Indonesia

Reef of Orange Cup Corals, Tubastrea coccinea, Tanimbar Islands, Moluccas, Indonesia

Anthias over Coral Reef, Tufi, Solomon Sea, Papua New Guinea

Lyretail Anthias, Pseudanthias squamipinnis, Triton Bay, West Papua, Indonesia

Anthias over Coral Reef, Tufi, Solomon Sea, Papua New Guinea

1 cm yellow tube polyp captured at 4.5x life size with what appears to be a small macroscopic Isopod feeding on it, Bonaire, Caribbean Netherlands.

Detail of coral polyps, Tubastrea sp., growing on a healthy reef in Raja Ampat, Indonesia.

A bright cup coral, Tubastrea sp., grows on a remote reef in Raja Ampat, Indonesia.

Diver explores the reef wall covered with orange cup coral (Tubastrea sp.), Coconut point, Apo island Marine Reserve, Philippines, Southeast Asia, Asia

Blue sea star (Linckia laevigata) and orange cup coral (Tubastrea faulkneri) at night, West Escarceo, Puerto Galera, Mindoro, Philippines, Southeast Asia, Asia

Orange cup coral (Tubastrea faulkneri), open polyps at night, West Escarceo, Puerto Galera, Mindoro, Philippines, Southeast Asia, Asia

Cup coral colony (Tubastrea micrantha) A diver looks down on a large cup coral colony. Komodo, Indonesia, Pacific Ocean.

Diver looks at diverse coral reef including a green cup coral colony (Tubastrea micrantha) Komodo, Indonesia, Pacific Ocean.

Thousands of scalefin anthias (Pseudanthias squamipinnis) hovering over green coral (Tubastrea micrantha), Puerto Galera, Mindoro, Philippines, Southeast Asia, Asia

Diver explores the reef wall covered with orange cup coral (Tubastrea sp.), Coconut point, Apo island Marine Reserve, Philippines, Southeast Asia, Asia

Green coral (Tubastrea micrantha), detail of open polyps at night, West Escarceo, Puerto Galera, Mindoro, Philippines, Southeast Asia, Asia

Reef wall covered with orange cup coral (Tubastrea faulkneri), Verde Island, Philippines, Southeast Asia, Asia

Thousands of scalefin anthias, Pseudanthias squamipinnis, hover over green coral, Tubastrea micrantha, Puerto Galera, Mindoro, Philippines.

Reef wall covered with soft corals and gorgonians, mainly orange cup coral, Tubastrea faulkneri, Verde Island, Philippines.

Orange cup coral, Tubastrea faulkneri, Dumaguete, Negros Island, Philippines.

Blackside Hawkfisch (Paracirrhites fosteri) in Green tube coral (Tubastrea micranthus), Gangga Island, Bangka Islands, North Sulawesi, Indonesia, Molucca Sea, Pacific, Asia