For sure a koran, I have an emperor and that is no juv emp. The back of the fish is very different for both fish. On a side note I have seen some big korans still with juv coloration. My LFS has a 8 inch still complete juv coloration and a buddy of my just got one from a friend who has had it for three years and is now a 4-6 inch fish still in juv colors. But this is no emp and if you had you heart set on one I would return it. Also the korans tends to be much cheaper than emps so hopefuly you didn't get nailed on the price.
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