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Originally Posted by Johnny Reefer
... it is not necessary because I do not keep any SPS. Just LPS, softies and I have 1 clam, .
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All of the above critters need Ca just like SPS, so this would be a bad reason to allow Ca to drop below ~350. Clams and LPS especially need Ca, just as much as SPS.
And while I don't test or need Mg, if you have to in order to keep levels right for your critters, then by all means you should do it. IMHO