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I recently removed some seiyu stones from my tank to lower my KH / PH for my CRS, but some reason my PH is still pretty high.

30 gallon tank
GH- 6
KH- 4
PH- 7.5 without Co2
PH- 6.6 with Co2 injected (30 ppm)

When doing water changes, I only use RODI water, which should have a neutral ph of 7. Why is my PH closer to 7.5, instead of closer to 7? The only rocks that are left in my tank are 4 tiny ones that are holding my Baby tears down in place so they wont float.

I never had my PH higher than 7.1 before, and now its at 7.5. Any ideas why?

I do not have much space left in the main tank, but I was thinking on getting a few pieces of drift wood, and placing them in the back sump area of my tank to help lower it. Will this be a problem?
 

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Unless it is those few remaining stones, I do not know why the pH is higher than the source water.
The KH is high enough to keep it stable, too.

What happens if you do a larger water change (50%) so that the KH ends up at about 2 degrees? Will it come back up?
 

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How much water did the stones displace. Maybe the five gallon water change isn't enough now? Does the stone naturally lower pH?
 
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