Giant Cup Mushroom Coral

The Giant Cup Mushroom Coral is also known as the Giant Disc Anemone, Giant Mushroom Anemone, or Giant Flower Coral, and sometimes the Large Elephant Ear. A member of the order Corallimorpharia (Stephenson, 1937), it shares some similarities to stony corals, which is why it is also known as the Giant Coral Anemone.

Amplexidiscus fenestrafer

Quick Stats: Giant Cup Mushroom Coral

Family: Discosomatidae
Range: Indo-Pacific
Color Form: Tan, Brown, Green
Ideal Supplements: Iodine, Trace elements
Reef Compatible: With caution
Tank Conditions: 72-78ºF; sg 1.023-1.025; pH 8.1-8.4
Water Flow: Low to Medium
Light: Medium
Dominance: Semi-aggressive
Placement: Medium
Care Level: Easy




It is very easy to maintain in the reef aquarium with a medium light level combined with a low to medium water movement. It can expand to over 12 inches in diameter during the day. It is considered semi-aggressive and requires adequate space between itself and other corals. When a fish brushes against it, it forms a ball around the fish, from which the fish generally cannot escape. Since it eats fish, it is best kept in its own aquarium that has a sandy bottom and large rocks.

If kept in a reef aquarium, it should be fed large meals of Artemia and other plankton-like foods. It also receives some of its nutritional requirements from the symbiotic algae zooxanthellae hosted within its body.