Feed your bottom fish a delicious, nutrient-rich food that produces less ammonia for cleaner, clearer water with API Bottom Feeder Squid Pellets Optimal Protein Sinking Pellets. Overfeeding, low palatability and low quality lead to unconsumed or poorly digested food which causes waste and raises ammonia levels. High levels of ammonia are toxic to fish and can cause gill damage, stress, illness and death. API Fish Food produces up to 30% less ammonia than leading competitor foods because they are made with highly palatable squid and nutritionally enhanced protein for maximum digestion. The more nutrients your fish digests, the less waste and ammonia. It is a complete and balanced diet for all bottom-feeding fish including Catfish, Plecostomus and Loaches.