Entacmaea quadricolor, the name itself means they are found in four colors. Brown, green, red, and a very rare orange.
It can not regain the zooxanthallea without proper lighting for photosynthesis to accure, feeding will not do that...It needs good lighting, I hope you have it...
IMO, if you dont know what bleaching is then you didnt research befor purchaseing this animal.....research, dont take my word for it.