Actually the same substances that salmon farms use (Carophyll Pink/Red) to give color to a fishes flesh to make it look more appealing to consumers, will most definitely enhance the "outside" of the fish as well. That is exactly why Asian Discus breeders use it in their feed mix for red fish. It can turn a fish that is naturally yellow, to an unnatural orange, or a fish that is naturally pink, to blood red.
The same company that produces Carophyll Pink also makes a yellow enhancer for egg yolks.
You can read more about this in the folowing past discussion.
http://www.monsterfishkeepers.com/f...My-Red-Discus-Before-amp-After-Carophyll-Pink
Most of the OP's pics are now gone, but the fish shown were genetic crap, washed out pink - that after being jacked up on Carophyll Pink became blood red. Tony hasn't posted here in 3 yrs, and the link to his website is now DOA, so I guess his sales didn't take off the way he was expecting?