intarsiabox... bit, but its been there for a while
newbie2... 0.3dkh decrease after I had already increased the daily dose by ~14% in the week prior following the 0.8dkh decrease.
dino... true, but I would expect their calcium and alkalinity demand to be more consistent. As for my salt, I use H2Ocean and I always toss it around between buckets to ensure I've mixed whatever settlement may have happened during shipping. My mixed saltwater consistently tests around 10 dkh. Interesting points though, might be worthwhile to run a batch of tests before my waterchange, a few hours after, then the next day.
Another thought, I use 500ml dosing containers so I run nearly 3 months before having to top them off again. At the moment they're quite low so maybe the alkalinity mix separated out in the container or lost some potency?
Otherwise I'm trying to think of some change in my tank that could account for the sudden draw.
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