Alrighty, got new info. Brought a fish home from the LFS today and tested THEIR water (which they told me was not special water. It is just conditioned city tap water) Their water tests at the same PH as mine: 8.2. So I am pretty sure that it's just the oxygenation that is causing the PH to go up.
Nonetheless, I am going to let a bucket of treated tap water sit out for the next few days, just to be doubly sure! I'll check the gravel, too.
Thanks for the suggestions. I am glad this mystery appears to be solved.
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