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My KH is only about 3 degrees out of the tap (around the 50 ppm mark) I added 3 large bits of driftwood, before fish, and the PH dropped from 7 to 6. This is in my 75 P tank.

It looked like it would keep dropping so I am now using a little coral in my filter to level it out at 6.8. These pieces are big though around 2ft long each one and pretty chunky and wide too.

If you KH is really high it is virtually impossible to change your PH. Only if the pieces are large and your KH is low should you worry.

My water is very yellow from the tannins if that bothers you. I don't mind it and P's love it.
 
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