Aqueon Tropical Freshwater Fish Food Feeder, 3-day, 4 count; There's no need to have someone feed your fish while you're away with the Aqueon Tropical Freshwater Fish Food Feeder. Place a feeder block in the tank before you leave, and it will slowly dissolve over a period of 3 or 7 days to provide a steady release of food. These nutritious blocks are full of premium ingredients for a balanced diet that keeps your fish healthy and energetic. With the convenience of Aqueon Tropical Freshwater Fish Food Feeder blocks, you'll be able to take a trip knowing that your fish will enjoy proper nourishment.