I feed my fish a varied diet of regular flakes, color enhancing flakes, freeze dried blood worms, freeze dried
brine shrimp, freeze dried tubiflex worms, frozen Blood worms and a frozen mixture of a bunch of stuff that I can remember.
I would suppose that some brands of food are better than others Omega One seems to be a high quality brand as is Hikari. I guess like most thing, you'll get what you pay for.
Check the label on the color enhancing flakes. I think it says to feed them the color enhancing flakes 3 time a week (but I'm not sure and can't check the lable because I'm at work).