I've been doing some research on altering
pH, as my pH is pretty high, and have discovered some interesting information on this task.
I have often heard people say that they use
driftwood to lower their pH, and always wondered about this, because I've got driftwood in three of my tanks, and it hasn't affected my pH at all.
I found out that hard water will negate the tannins' effect on the pH, meaning that hard water also negates the pH lowering effect of peat.
So it seems that lowering pH also requires using
RO or distilled water.
I think I'll be doing some tests on this, as I'm going to have an empty 10g tank to play with in a little bit.