Fritz Ph Tablets 6.5 2/Card

Over time, water becomes more acidic with a lower pH. The natural checks & balances found in nature are missing in an aquarium. Water changes will not make up for this decline; pH will even fall between weekly water changes. Natural buffers must be replaced to maintain a stable pH. That's why Fritz pH Blocks are so handy; they work by slowly dissolving. As the Fritz pH block dissolves, it releases natural buffers that keep the pH at the target level. Each block maintains pH for up to two months with a pH variation of ± 0.2. Only one block per ten gallons is needed. After two months the block will have dissolved; replace with a new one. Fritz pH Blocks work best if water is first adjusted within 0.5 pH units of ideal pH. Using a pH Block after pH adjustment will avoid "pH rebound". If you are within 0.5 pH units of your goal, just toss in a tablet. They can safely be put in the filter, on the bottom of the tank or anywhere there is good water flow.
FRITZ pH BLOCK 6.5 is ideal for Tetras, Catfishes, Angelfish, Discus & soft-water cichlids.