Common name: Giant Cup Mushroom Coral

General information

The Elephant Ear Mushroom, Amplexidiscus fenestrafer, is a large polyp stony (LPS) coral often mistaken for an anemone due to its size and appearance. It is known for its expansive, cup-shaped polyps that can extend several inches in diameter. The coral exhibits a variety of colors, typically in shades of brown, green, or tan, with a leathery texture. It is a solitary coral, meaning it does not form colonies like many other LPS corals.

Care

Amplexidiscus fenestrafer is relatively easy to care for in the home aquarium. It requires moderate lighting and water flow. Too much light or flow can cause the polyps to remain closed. It is important to provide ample space for the coral to expand without coming into contact with other corals, as it can be aggressive and may sting its neighbors with its sweeper tentacles.

Feeding is straightforward; the Elephant Ear Mushroom will accept a variety of meaty foods such as mysis shrimp, finely chopped fish, and other coral foods. It can also absorb dissolved nutrients from the water.

Reproduction

In the aquarium, Amplexidiscus fenestrafer can reproduce asexually through a process called fission, where the coral splits into two or more parts, each becoming a new individual. This process can be encouraged by stable water conditions and regular feeding.

Symbiosis

While not known for hosting fish or invertebrates, Amplexidiscus fenestrafer can sometimes be a temporary refuge for small fish and mobile invertebrates due to its large, enveloping polyps.

Habitat

In the wild, Amplexidiscus fenestrafer is found on reef slopes and lagoons in the Indo-Pacific region. It prefers lower light conditions and can often be found in crevices or overhangs where it can extend its polyps to capture food from the water column.