Garlic Guard is an all natural garlic scented odor and flavor enhancer for freshwater and saltwater fish. Our research has shown that many fish are attracted to natural odors, such as garlic. Simply mix Garlic Guard with any food item, such as Sachem's Nutrient Flakes, to attract the interest of finicky eaters, e. g. discus and marine angelfish. Garlic Guard is safe for reef and planted aquariums.