Mushroom Coral

About

Mushroom coral (Cycloseris fragilis) is a solitary, free-living stony coral native to the Pacific Ocean, where it ranges across a remarkably broad depth span from shallow reef flats down to around 400 meters. Unlike colonial corals that cement themselves permanently to rock, this species exists as a single, independent polyp sitting loose on sandy or rubble substrates. A growth form sometimes called a 'fungiid' coral. The circular disc shape with radiating septa gives it a classic mushroom-like profile when viewed from above, which is where the common name comes from. In the aquarium, it does best placed on a sandy bottom rather than mounted on rock, mimicking how it lives in the wild. It appreciates moderate lighting and gentle water movement rather than the strong flow that many other SPS corals demand, which makes it a reasonable entry point for hobbyists just getting into stony coral keeping. Because each specimen is a single polyp rather than a colony, it tends to be a bit more forgiving than branching or plating corals when conditions fluctuate slightly. That said, it still needs stable water quality and appropriate feeding attention like any LPS coral. A rewarding and somewhat unusual coral for a peaceful, low-flow reef setup.