Gulfstream's Target-Ease 6.5 is a powder freshwater pH buffer to adjust the pH of your aquarium water for freshwater fish that require a pH of 6.5 such as discus and neon tetras. The primary functions of the pH buffers are to resist pH-drop, and pH increase. This buffer also helps to reestablish a target pH level after making partial water changes. Check the pH regularly when using this product. Be sure to follow directions carefully when using any water additives for your aquarium.