Waterlife 6.5 BufferLowers pH and hardness of tap water for acid loving fish and plants. A true buffer, which softens and acidifies tap water for acidophilic fishes and plants. Once the right amount of 6. 5 Buffer has been added a pH of 6. 5 will be achieved and maintained. This mechanism makes 6. 5 Buffer a safe method of adjusting pH. Features: Creating ideal water conditions for acid loving fish and plants. Softening the calcium carbonate or bicarbonate conditions to