05-21-2011, 02:09 PM
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Actually, there are a few natural ways of lowering your pH. One is the addition of drift wood, and letting the tannins leak out into the water. It'll make the water brown though. Another is the use of peat moss, or a peat ball, and you let it soak and it'll bring down your pH as well. Finally, which is the way that I use, is the mixture of RO or distilled water with tap water. I use something like .5-1 gallon of tap water for 4-5 gallons of RO/distilled water. I mix the two, use my dechlorinator, and then when I do water changes I use the mixture. It'll slowly bring down the pH, but it'll take some time. My tap water pH was between 8.2-8.0, and since using the mixture its gone down to 7.4 or so.
These are natural ways of lowering your pH, and as mentioned, I would not use chemicals as they drop the pH too fast and do not last.
In terms of the cause being a fish disease, that could be the case as well, but you should ask Byron or bettababy. They have a large information pool, so they should help you out in this case if its a fish disease or not. Best of luck!