Nutrafin basix 7 Day Fish Feeder has been specifically formulated to provide food and multi-vitamins for your aquarium fish for up to 7 days. The slow release feeder provides a varied diet of pellets and multi-vitamins for community aquariums up to 10 U.S. gallons (37.8 L). For larger aquariums simply add one block per 10 U.S. gallons (37.8 L). Ingredients: Calcium sulfate, fish meal, corn flour, wheat flour, soybean meal, wheat gluten 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