Tropheus are bloat magnets when fed a poor quality diet, for the most part they are herbivores, specifically algae grazers, which have a very long digestive tract that need to be fed the correct diet. The key is high quality easily digestable proteins. So when your looking for foods it's not about the protein percentage, but rather the quality of the proteins themselves. Food that derives it's protein from high soybean, corn, wheat flour and other fillers is not nearly as digestible as a high quality pellet that utilizes the entire fish not just the left over bi-products from other industries; such as Whole Antarctic Krill Meal, Whole Herring Meal, Whole Squid Meal is what your looking for. Coincidentally that's the same stuff New Life Spectrum uses, I'd feed that exclusively and call it a day.