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pH swings from water that is left out is largely due to outgassing and what ever is going to happen because of it is usually over within 24 hours. Daily pH swings are common on planted tanks as during the night when they aren't photosynthizising they release carbon dioxide rather than absorb it. In a lowlight tank the plants are likely not utilizing much of the CO2 in the water and therefore the swings are likely much lower, low enough to be difficult to detect by conventional means.
Watch my tank progress from Craigslist salvage to fishy habitat: Aaron's Tank
The only things that happen quickly in an aquarium are bad things.
I still think you should test the rocks, just because of my experience with them. I really have never heard of any water changing that drastically from just being left to sit. And I did do quite a bit of research on this once I noticed what my water was doing.
20 gallon long: 3 adult Neolamprologus similis + about 11 fry of various ages; low light planted tank
20 gallon long:2 freshwater dwarf puffers (Puff Puff and Poofer); medium-light planted tank
10 gallon: 1 male betta named Wormy; low light planted tank
10 gallon: 1 male betta named Dante; low light planted tank
2, 5.5 gallon tanks that are currently empty (I see more fish on the horizon )
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