Spectrum Growth Formula, 0.5mm sinking pellets. New Life Spectrum Premium Fish Food is simply the best aquarium diet on the market. New Life Spectrum not only increases the color and vitality of both freshwater and marine fish, it provides essential elements found in the natural environment that are missing from aquariums. All natural New Life Spectrum contains no hormones. It noticeably increases color and vigor in all fishes saltwater and freshwater.