For plecos and all algae eaters. All vegetable fish food. Depend on Wardley caring for fish since 1950. Wardley Algae Discs are an all vegetable food for plecostomus and other algae eaters. Formulated with spirulina as its main ingredient, this blue green algae is known to help maintain the brilliant coloration of your fish. With the addition of stabilized Vitamin C, this food is a perfect diet for all bottom feeding and herbivorous fish. Made in the USA.