Educated guess based on previous pic and the current one albeit a full side view shot would paint a better pic - the tail and the rear fins do not show the typical RTG or Malaysian Golden traits. The inner core of the scales have strong horseshoe markings typical of a Green Aro/Yellow Tail. The gold shine is now quite apparent though. It's highly likely a hybrid. What exact parentage resulting in this kind of hybrid is hard to ascertain. Could be several generations of hybridization.
Regardless, if you as the owner like the fish, very little else matters. Did it come with a certificate? If yes from which farm?