08-22-2006, 09:39 PM
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Some rocks like limestones contribute to high pH. Substrates will also contribute to high pH. If you test both with vinegar and if they do fizz violently, don't use them. They clearly indicate that they can raise the pH.
There are many ways of lowering pH but you must monitor that to ensure you're not lowering it beyond the capacity that the fish will not be able to adapt well. Peat, rainwater and bogwoods are a few methods I can mention but make sure that when you use rainwater, it's not coming from industrial areas where pollutants are likely to harbor in the rainwater.
Danios don't balance your water chemistry and neither do other fish.
Don't be too concerned on your pH. Danios are very hardy and will survive the cycling which has many extreme changes.