Northfin is good, no need for the others. I don't like flake and find clean water does more for the colors than food. But the northfin already has krill and Astaxanthin, a type of carotenoid responsible for the red-orange colours in some ornamental fish. Animals pigmented with Astaxanthin take on a more natural even colouration.
I have peacocks and hap most are carnivores but my red empress are herbivores so the pro f green I feed is veggie iv only been keeping them 6 months as I did keep normal tropical fish and American cichilds