Sometimes you have to go by what the animals tell you. They will usually tell you if your tank is about to go south long before a test kit picks it up. It's a feeling you pick up after months of looking at everything for hours on end and you figure out which inhabitant is the "canary in the gold mine" the one that tells you first that something isn't right.
I'm pretty sure if your ph suddenly dropped to 7.15 then more then one critter would show signs of stress
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