API Sinking Squid Pellets Bottom Feeder Fish Food, 4-oz bottle; Feed your bottom fish a delicious, nutrient-rich food that produces less ammonia for cleaner, clearer water with API Bottom Feeder Optimal Protein Sinking Squid Pellets. These pellets produce 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. Feed twice a day, and provide only as much as your fish will consume within 30 minutes.