Zoo Med's Betta Banquet Food Blocks are made with whole Mirco Betta Food Pellets and Krill to provide essential nutrients that Bettas need. As the block dissolves, Betta Food Pellets are exposed allowing your Betta to feed throughout the day. Each block will feed one Betta for up to 7 days depending on the pH and hardness of the water. Be sure to perform routine water changes weekly.