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I dont say that needs either but should fulfill the purpose better if you really need to lower ONE element (or maybe a few)LOL
All of these salts have a WIDE variance in mixture (macro & trace). I would embrace the prospect of customizing the mixture according to the tank needs and aquarist input.
Most (but not all) high quality salt is good enough. I have had red sea since 20 years back and maybe done 100 icp tests. Not a single issue ever with this salt.
Jonas
