Hikari Bio-Pure Freeze-Dried Blood Worms are a great treat or daily diet for all types of tropical fish and most freshwater fishes, including cichlids, discus, bettas, and goldfish. Made using pharmaceutical freeze-drying techniques, this product is as close to fresh as humanly possible and has a texture and taste not previously available in freeze-dried food. These worms are multi-vitamin rich to reduce stress and stress related diseases, and are nitrogen charged to reduce oxidation prior to opening. Once opened, oxygen absorbers reduce oxidation, which means less waste and lower cost per feeding. Freeze-Dried Blood Worms have a patented ratcheting dispenser top which keeps the product fresh, allows you to dispense the right amount of food, and therefore eliminates over-feeding and water clouding. In addition, they are free of parasites and harmful bacteria.