Zeigler Algae Discs is a complete and well balanced, sinking diet for aquatic herbivores such as Plecos and Algae-Eaters. The highly degistible ingredients come from an array of plant sources plus several marine products to increase palatability, digestibility and coloration. Wheat Germ, high levels of stable Vitamin C, and Brewers Yeast are included to promote healthy gill, fin and tissue development. Plus this diet has been formulated to reduce waste and increase water clarity.