01-17-2009, 03:25 PM
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'pH is poo-poo'.. Water with a higher mineral content merely supports more good & bad bacteria that fish from soft, acidic waters cannot handle well. Also, the ammonia (ammonium) content of water is pretty much non-toxic @ pH's under neutral (7.0) but becomes progressively lethal as pH increases. That said, if you want to decrease the pH naturally, you could put peat in the filter and/or use RO or deionised water to dilute (lower the hardness / pH) the water in the tank. Also, you will usually find that pH tends to drift lower in an established tank,
I have kept & bred many soft-water fishes; including bettas, in the type of water that you describe & would tend to recommend that you use the water that you are dealt & do regular partial water changes.