I think wkndracer my have figured it out:
Glass of water right out of my tap (with the aerator unscrewed, just like it would be with the water changer) gives:
6.2 or lower PH (low as the test will read)
0/0/10
0 GH
no chlorine
After 12 hours standing on the counter, ph reads 6.8.
Not fond of airstones in the tank all the time, but looks like I need to run one during water changes (and to let it splash in from above the line, not gently enter underwater)
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