The Planted Tank Forum - View Single Post - Help--weird pH changes going on in brand new 55 g tank
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post #3 of (permalink) Old 07-19-2012, 01:30 AM
Planted Tank Guru
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Run some tap water into a glass and test it right out of the tap, then set the glass aside and test it 24 hours later, then 48 hours later.

Do a second glass or bowl at the same time and put in one of the questionable rocks. Same testing procedure: 24 hours, 48 hours, then several days later.

Test for pH, GH and KH. TDS, if you have a meter.
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