I think lighting has more impact than food. I have an AquaGlow light that high reds and oranges; my sword tails look unreal.
My LFS has a large show tank with the most colorful (and expensive) fish. What most people don't realize is that over the tank is a couple thousand-dollar lighting system. They turn on one set of blue-enhancing lights when the tank has AC Peacocks (e.g., Electric Blue Ahli's) and another set that high lights red and orange, etc. So when I buy fish from that tank, they never look as colorful; even after weeks of NLS, Spiraluna, etc.
My LFS has a large show tank with the most colorful (and expensive) fish. What most people don't realize is that over the tank is a couple thousand-dollar lighting system. They turn on one set of blue-enhancing lights when the tank has AC Peacocks (e.g., Electric Blue Ahli's) and another set that high lights red and orange, etc. So when I buy fish from that tank, they never look as colorful; even after weeks of NLS, Spiraluna, etc.