As far as the dosing part goes, you will always find someone who doses some form of iodine.
However, when the great majority of people DON'T dose it, and their tanks do just as well as the ones that DO dose it, what does that tell you?
That, plus the fact that Randy's credentials to be able to say that it is not needed, speak for me at least.
There is also the old adage, if you can't test for, and find it lacking, don't dose it.
Unfortunately there are NO hobby test kits for any form of iodine, that can accurately tell you what the levels are.
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