Flower pot coral. Don't have one myself, but according to some sources:
"It is aggressive, and ample space should be provided between itself and other neighboring corals. Its polyps can extend far past its base into the reef aquarium, where they can sting other species of corals."
"Goniopora sp. require PERFECT water conditions, the proper trace elements and the habitat must match its requirements. One can only do this Goniopora Coral justice by leaving its care to the experienced hobbyist with the expertise and time to keep the coral properly."
"Not suitable for most aquariums, colonies usually die within a year. Very agressive. Difficult to keep alive. Potent nematocycst are capable of inflicting severe damage to nearby corals."
"The Goniopora or Flowerpot Coral has always been a controversial coral in the hobby. Once thought to be impossible to keep, it can now be kept by experienced hobbyists but is still high maintenance. Most die within 3 to 6 months."
Sorry I couldn't find any good news about it :(. I'm sure there are people on here that have kept them successfully and can give you some tips though.