Hikari Tropical Algae Wafers are a scientific diet for Plecostomus and other algae eating fishes including marine herbivores. - A perfect balance of premium-select ingredients developed to promote proper growth and desirable form in most herbivorous species. - Contains higher levels of vegetable matter and multiple algaes that plecostomus and other algae eaters prefer. - The uniquely shaped disc sinks rapidly and retains its shape allowing less aggressive species ready access to its nutrition. - The perfect treat for your omnivorous fish to super-charge their nutrient intake. - Contains pure-cultured spirulina and chlorella algae to help your underwater friends look their best.