You usually should not need extra magnesium when using B-ionic unless your salt mix for water changes is lower than your target (which doesn’t apply to you) , and you will never “need” it as frequently as daily. But if you know you need it, it is fine to add extra magnesium.
Yep, I've used very little. Almost none. Since ESV has the Magnesium in the Calcium component, it's a true "2-part" buffer. (-:
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