Why dose Seachem iron and phosphates with Thrive S?
Any way to double check your kh/gh tests with a known source? Usually, but not always, kh and gh are similar when taken from nature (I'm assuming you use tap). Or is that an active substrate that you are using? If so that would account for the drop in kh.
Lastly what is your dosing of each of those?
Having now read your other post, I'm guessing went too long with the h2o2 dip.
It would still be interesting to know why and how you are dosing Thrive S and the Seachem products. :-)
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