The vast majority of SA/CA species of fish are omnivores, and once they reach the semi adult stage of life no longer require massive amounts of protein or fat for proper growth and overall health. Even those species of cichlids classified as carnivores do not require 50% protein on a regular basis, and certainly not on a daily basis. This is a common mistake made by many fish keepers who in a rush for quick growth gains in their fish don't stop to realize the long term ramifications of that kind of growth.
fishman - several weeks of feeding a few fish on a food will not tell you much of anything. Before that you were all about NLS (rah-rah-rah), and before that Hikari (rah-rah-rah). You haven't owned any one fish, fed on any single diet, long enough, to differentiate much of anything in regards to growth, OR overall health. I am only singling you out due to your constant recent cheering of a food that thus far hasn't been feed trialed by you for more than a few weeks. Sorry, but someone had to say it.
FYI - Wardley is still probably one of the largest fish food manufacturers in the USA. The very fact that they supply Walmart ought to tell you something about the volume of business that they do. But being the biggest, doesn't equate to the best. I personally avoid Hikari foods, and quite frankly wouldn't feed Xtreme either. Not saying that you can't get good results with either/or, there's just too many terrestrial based carbs for my liking in the majority of both product lines. At today's level of fish nutrition there's no need to be feeding ones fish ingredients such as soybean meal, ground wheat, corn flakes, rice, etc. But if I had to, I would probably feed Xtreme over Hikari, for no other reason that at least it's made in the USA, vs supporting a Japanese company. That, and no matter how you slice it @ almost $25 a pound Massivore is a MASSIVE rip.