Aahh now I know what your talking about. I have gotten that as well just never noticed that it only showed up after 24 hours. I have had it after 2 hours or 36 hours and I don't really know what it is either as I have never tried to put it in water and run tests on it.
I guess what I was trying to figure out was how levels of the various things that we test for would change from 24hrs to 36hrs or more (except if there is much evaporation). I wonder though if this may be borine? Don't know. The only time I have observed changes in common tests is during the first 24hrs. after newly mixing. I have tested IO, Seachem, Formula and Tropic Marin.
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