From my research after fuel's pointer, think this is distichopora lace coral or distichopora sp.
The picture in the below link also have the same colour and looked like mine.
http://www.themarinecenter.com/corals/cora...oporalacecoral/
it is technically a Hydrocoral, and is more closely resembles "Fire coral" (Milepora) sp. These rare corals have a highly branching form and are non photosynthetic. They should be kept in dimply lit spots or in caves in the aquarium and provided with medium to strong water flow and offered supplemental feeding.