I have many tanks. The tank in the pictures is a 75gallon. The angel in the pictures is an EMPEROR angel. When he gets too big for this tank he is going in my 180gallon salt tank.
In your first picture the juvi angel looks like a Koran, your second pic, yes it looks like an Emporer. Hence the confusion. http://wetwebmedia.com/marine/fishes/angels/pomacanthus/Pomacanthus.htm
Even the Koran has a semicircle, to a full circle like the top pic of the juvi angel. My bad that I did not notice the bottom picture.