I'm not 100% sure that dKH number is correct. I've had low dkh with brand new water, my 180, denny has low dkh at the store with that salt... all of sudden its through the roof. Something seems off.
I know its hard to mess up a test with that Hanna ALK Checker (i have it too) but that much variation in a tank the size of yours (which would take a few bags (or boxes even) just seems very strange to me.
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