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A daily testing although does not hurt can be unnecessary and not to mention cost of reagents, etc. I wonder (just a wonder) if your Auto changes are giving you swings??? As a test, I would turn off auto changer for a week and see if numbers stabilize. While a great concept, can also create swings and changes beyond control.I test alk and salinity daily. Due to consumption and I do a 1% auto water change and auto top off. The water change and top off are susceptible to failure.
I noticed you said you used distilled water, I would personally try to source RODI water. I know you said you have poor floor at your home but its probably better making the trip to the LFS to buy RODI than to use distilled.
I know it should be ok, but that's was just the one thing that really stood out from the OPs post.Yeah, I’m surprised no one mentioned it up there a while ago. But theoretically distilled “should” be ok to use.
Distilled water is also made from steam and loses it ability to assist with buffering of PHI've read somewhere that distilled water can have copper in it due to being distilled through copper pipes, dont know if there is any truth to that and if it were true I'd think the inverts would be toast.