03-09-2010, 05:21 PM
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Agree. Your pH depends upon the water hardness and biological actions in the aquarium. Most tap water has a certain degree of hardness (it varies from place to place) and this acts as a buffer to keep the pH as it is. Chemicals to raise or lower pH will do so immediately, then the water buffers it back, and the result is fluctuating pH. With fish in the tank this is going to cause health problems long-term, it attacks the immune system via stress for one important thing.
The question to be asked is, why do you want a pH of 7? No fish in nature lives in water with a pH of 7, it is either below (acidic soft water fish) or above (livebearers, rift lake cichlids, some others). Some advice still goes around that pH should be neutral (7.0), I assume in the mistaken belief that you can then combine all these fish together and it will suite them. When the fact is, it suits none of them so they all suffer ill health.
If you need to raise the pH and hardness, we can advise how to do it safely. But first, what fish do you want to keep? And do you know the hardness of your tap water? I'm assuming your tap water pH is around 6.4 or is it different?