Lol this is weird - I know the guys who started Southern Delight. I had no idea it was a country-wide food!
And as for a totally unbiased opinion, I have noticed a difference in coloration when I feed my cichlids the color enhancing pellets (the red ones). Specifically, after a month of feeding them to my adult "rock kribensis" his orange turned waaaay more reddish.
That being said, I did notice that it makes the water a bit cloudier than other pellets. I still use it, but I tend to mix it with some pellets from another brand.