Randy, I think you are mistaken as Reef Advantage Calcium use Blend of calcium, magnesium, and strontium chlorides. Only the regular Reef Calcium use gluconate.
I think that is what I said, but perhaps I did not make it clear enough. The first sentence is about the polygluconate product, the second is about the Reef Advantage Calcium..
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I am not a fan of Seachem Reef Calcium because of the polygluconate.
The Reef Advantage Calcium can be used in this application, but bear in mind that it may or may not already be ionically balanced, and does supply some magnesium and strontium."