I am having a frustrating problem of keeping my PH below 7.5! I have taken each item in the tank (rocks, a couple pieces of driftwood and samples of the gravel) out and placed each in a water pail and watched the PH over a 24 hour period. My house water is 7.1-7.2, and none of the items raised the PH at all. I can reduce the PH to about 7.3 with fresh water and PH Down liquid, but within 6 hours, the PH goes back up to 7.5-7.6! Twice I completely emptied the tank and washed the gravel and tank and refilled it with no results. I do have a significant amount of live plants. Could they be the problem. Any help would be appreciated.
Namibia.
Namibia.