04-26-2013, 04:23 PM
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Originally Posted by JDM
I don't think that the sand was the culprit as it is mostly inert... as long as it is a quartz sand even if it did have a small component of limestone or shell material. I had the same thing happen in a tank that the water was not changed in for months and it was a gravel substrate.. dGH was up to 19... don't recall the KH now. It was due to topping off the water instead of changing it (sounds familiar?) and now it sits at 9dGH with regular water changes. I'm not sure how the peat would offset this evaporative increase in hardness offhand though.... needs some thought unless someone knows?
Actually that was my kh. 19+ degrees. GH was in the 35-40 degree range.
(after years of operation)
With peat moss in the substrate kH stayed at 4 degrees and gh at 9 degrees for 2-3 years or so.
pH in both cases was 8.4-8.8 api high range test kit.