Zoo Meds Original Banquet time release feeding blocks last 3 to 14 days, depending on block size. In addition to weekend and vacation feeding, Original Banquet is a great daily food source for problem feeders such as Plecostomus, Algae Eaters, Redtail Sharks, Gouramis, Saltwater Tangs, Angels & Damsels. Original Banquet blocks are also very useful for small fry which do best when constantly feeding. Now with high protein micro pellets! Great for bottom feeders. Do not use this product in fish bowls or aquariums which do not have aeration or filtration. Original Banquet blocks will not cloud water. Place the time release food block in your aquarium. Multiple food blocks can be positioned across aquarium floor to accommodate territoriality aggressive fish. One Original Size Banquet Block will feed approximately 15-20 average sized aquarium fish. Comes in 3 sizes. Ingredients Calcium Sulfate, Fish Meal, Flash Dried Blood Meal (non ruminant), Poultry By-Product Meal, Soybean Meal, Wheat, Wheat Flour, Fish Oil, Lecithin, Iron Oxide, L-Ascorbyl-2-Polyphosphate (stabilized Vitamin C), Dicalcium Phosphate, Choline Chloride, Niacin, Thiamine Hydrochloride, d-Calcium Pantothenate, Pyridoxine Hydrochloride, Biotin, Beta Carotene, Vitamin E Supplement, Riboflavin, Thiamine Mononitrate, Folic Acid, Vitamin A Supplement, Vitamin D3 Supplement, Vitamin B12 Supplement, Manganese Sulfate, Zinc Sulfate, Ferrous Sulfate, Copper Sulfate, Sodium Selenite, Potassium Iodate, Propionic Acid (a natural preservative), Ethoxyquin (preservative). Guaranteed Analysis Crude Protein (min) 5.0% Crude Fat (min) 0.25% Crude Fiber (max) 1.5% Moisture (max)