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Originally Posted by Suparno View Post
I agree that fluctuating pH stresses fish, I said that previously, and thus recommended you not fiddle with the pH.
It is not strictly true to say that pH doesn't matter. But the prime issue is the hardness, as I said earlier, and you must get the numbers for this. GH is general hardness, and KH or Alkalinity is the carbonate hardness. These are very important, first because some fish are seriously affected by the wrong GH, and second the KH/Alkalinity is what "stabilizes" pH and prevents it from lowering in the aquarium, and also resists any attempt you might make to change it. Read the article I linked earlier, it will explain this.
You can get the GH and KH from the water people; don't waste one on a test kit that you may only use the once. If you have a link to the water data but can't fathom it, post it and I will taked a look.
As for the effect of rocks and wood, this depends. Wood will naturally tend to lower the GH and thus pH, but this is usually very minimal if at all. It mainly depends upon the GH and KH [back to that again]. Rock that is inert will not affect GH/KH/pH. But calcareous rock such as limestone, marble, dolomite, lava, as well as coral and shells, will raise the GH and thus the pH.
Byron Hosking, BMus, MA
Vancouver, BC, Canada
The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]
Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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