IMO a healthy dose of skepticism is a good thing, but not if it makes one become paranoid.
A few months ago I spoke with a professor at the University of Florida in the Dept of Fisheries & Aquatic Sciences, who specializes in dietary habits & nutritional disorders of fish. I was told that her dept had used New Life Spectrum (which contains garlic) "for years", as a control diet in their studies, as well as for newly arrived wild caught marine fish that are placed into quarantine, and that it "performs very well". I suspect that if they are using it for newly arrived, stressed out wild fish, they must consider it to be a very well balanced nutritional diet. The professor I spoke with deals directly with numerous marine species, has been involved in many marine fish studies over the years, and I suspect that she knows a tad bit more about the dietary requirements of fish, than the average hobbyist.
If she was at all concerned about the amount of garlic used in this food, she certainly failed to mention that fact to me.
Then again, perhaps I'm just making this all up, and the people in the link below don't even exist?
http://www.flseagrant.org/program_ar...tlas/index.htm