Aquatic Foods Inc. Wafers of Algae & Spirulina, Zeigler Wafers The Premium Pleco & Cat Fish Food Please note: All product photos are not exact, product color and sizes may vary a little High levels of vegetable matter that algae eaters prefer and love Perfect for Your Plecos, Cat Fish, Marine Fish, Shrimp even Snails Not guaranteed to Immediatelysink. As with ALL Wafers, there will always be some that take longer to sink. Some may even be Floaters.