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I also read somewhere that your aragonite sand will harden if your calcium is very high... well is this the case?
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There is a term used specifally in the reefing community for this, but scientifically it is fundamentally a precipitate. Where the excess elements bond with the aragonite to form lime stone. (correct) Essentially it is your tanks way of adjusting the levels quicker than if the corals were to utilize the excess elements.