DuraDisk Sinking Wafer Fish Food is made by a process similar to the one we use to manufacture our superior line of DuraFlake freshwater and marine foods, however, they are specifically formulated for feeding bottom and algae eating freshwater and marine fish. They are excellent for feeding Corydoras and other catfish, Plecostomus, loaches, and they are well accepted by various herbivorous Cichlids. DuraDisks have unparalleled benefits over comparative products: higher protein to carbohydrate ratio, higher levels of preferred fatty acids (HUFA), added natural color enhancers, and two types of algae.