Zoo Med Laboratories Plankton Banquet Block Feeders - Giant Size (3 Pack) 3 pack of time release fish feeding blocks Each 1.4 ounce block can feed your saltwater fish for 10 to 14 days Now contains twice the freeze dried plankton as well as blue green Spirulina chunks In addition to weekend and vacation feeding, Plankton Banquet is a great daily food source for problem and bottom feeders such as Plecostomus, Algae Eaters, Redtail Sharks, Gouramis, Saltwater Tangs, Angels, Damsels Made in the USA