Slowly releases food particles for up to 10 days in a 10 to 15 gallon aquarium. Calcium Sulfate, Iodized Salt, Corn Starch, Fish Meal, Ground Wheat, Soybean Meal, Corn Gluten Meal, Wheat Middlings, Wheat Germ Meal, Fish Oil Dehydrated Alfalfa Meal, Brewers Dried Yeast, Betaine, Dl-Methionine Spirulina, Choline Chloride .5 OUNCES