Fungia, commonly called Plate Coral, is a nice coral usually placed on the substrate. Several kinds are available to hobbyists, from flat ones to ones that resemble anemones due to the long tentacles rising up from the plate (Heliofungia). The one above is between these two kinds, extending feeder tentacles upward about 1". When I was given this specimen, it was about as big and as thick as a "lifesaver" candy. I glued the hardened base to a chunk of live rock with Super Glue Gel to keep it in place. After a few months, it grew about 2.5" in diameter. No special feeding was provided. It does require calcium and alkalinity matching natural sea water so it can continue to build its calcium base beneath the soft tissue.