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Bingo!!! I found the source of my pH problem and it turned out to be the substrate. I put a handful of the stuff into a glass of dimineralised water (ozone treated and filtered, equivalent to distilled). I immediately drew off a test-tube's worth, put in the drops, and saw the water turn...

Because the local (Montreal, QC) tap water is lousy--very hard and God knows what else. Just looking at what it leaves in a Britta filtre is enough to disuade you from using it as the medium for any living thing, unless maybe it were carp. Besides, the demineralised water is cheap, easy to...

rocks and water The water is de-mineralised water which I buy in big jugs at the drugstore, so I don't think that's it. There is one rock which could be the culprit, now that you mention it--I think it's limestone. I'll pull it and see what happens. The others are granite and basalt, not...

The pH in my ten-gallon community tank keeps rising and I can't for the life of me figure out why. Left alone the tank becomes very akaline in a very short time. I can gradually lower the pH to the neutral range, but within 24 hours it will be back up around 8.0 and in three days the solution...