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PH Dropping

2047 Views 7 Replies 3 Participants Last post by  fumoffu
My tap water has a PH of 7.4, but after it sits for a while the PH drops to around 6.2. I tested this theory by putting my tap water in a 5 gallon bucket and let it sit for 24 hours and the PH was the same as the PH in my tank which is 6.2. So I know it was nothing in my tank making the Ph drop. My current fish don't seem to mind the PH being that low but when I try to add fish they cant seem to take it, even after acclimating for an hour.

The tank has been set up for well over a year and this problem just has me baffled. What could be the possible cause of this problem and how could I fix it.

NH4 0
nitrite 0
nitrate 10
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Getting the KH up to a more stable level would be a good thing. But what also is going on here is a gas exchange into the water. The water coming out of the tap has less CO2 or O2 or something then the atmosphere. So when the two have balanced out it lowers the pH of the water since there is not KH to buffer. I am sure you could google a article to better explain it, but that is enough to get you started.
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