DYMAX Algae Wafers SupremePacked with high levels of spirulina these sinking wafers are ideal for catfish, bristlenose catfish, plecostomus, algae eaters, and other bottom feeding fish. The unique disc shape and fast sinking design prevent unnecessary food waste and promote natural feeding behaviors in bottom dwelling species. As the wafer retains its shape while being consumed gradually, you can relish the sight of your aquatic friends enjoying a delightful dining experience.