I started dosing Mg after finding out mine was only at 1200 and natural sea water is well above that. I've never had that great coralline growth plus I've had poor coral growth as well as poor polyp extension. I haven't noticed a difference in coralline growth but my polyp extension has improved quite a bit probably also to do with the additional flow I added. I've also noticed a bit of an increase in growth and I'm still working on increasing it to the level it should be. I'm not sure how important Mg is for LPS and softies but because SPS are so finicky, I would definitely recommend dosing anything within reason that will mimic their natural habitat.
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Jason
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