Nutrafin Basix 3-Day Fish Feeder is specifically formulated to provide aquarium fish with nutritious food and multi-vitamins for up to 3 days. The slow-release blocks contain a rich diet complete with multi-vitamins for community aquariums up to 37.8 litres (10 U.S. gal.). For larger aquariums, simply add one block per 37.8 litres (10 U.S. gal.). Ingredients: Calcium sulfate, fish meal, corn flour, wheat flour, soybean meal, wheat gluten meal, fish bone meal, dried yeast, vitamin A supplement, vitamin D3 supplement, vitamin E supplement, thiamine mononitrate, riboflavin, pyridoxine hydrochloride, vitamin B12 supplement, calcium pantothenate, niacin, ascorbic acid (source of vitamin C), folic acid, biotin, salt, choline chloride, calcium carbonate, dicalcium phosphate, manganous oxide, calcium iodate, copper sulfate, cobalt carbonate, zinc oxide, ferrous fumarate. Guaranteed Analysis: Crude protein min. 3.0%, Crude fat min. 0.3%, Crude fiber max. 5.0%, Moisture max. 18.0%, Calcium min. 19.0%, Calcium max. 23.0%, Copper min. 7 mg/kg