Zoo Med Labs Feeder Banquet Zoo Med's Original Banquet time-release feeding blocks last 3 to 14 days, depending on the 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 and Damsels. Original Banquet blocks are also very useful for small fry, which do best when constantly feeding. They come with high protein micro pellets and are great for bottom feeders. Multiple food blocks can be positioned across the aquarium floor to accommodate territorially aggressive fish. One Original Banquet block will feed approximately 15 to 20 average-sized aquarium fish. Do not use this product in fish bowls or aquariums that do not have aeration or filtration. Available in mini, regular and giant sizes.