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Instant Ocean Reef Crystals. Supposed to read 455ppm Calcium at 35ppt salinity.what salt are you using and at what salinity?
500 ppm is normal for reef crystal salt. I usually get readings of 470ish.Instant Ocean Reef Crystals. Supposed to read 455ppm Calcium at 35ppt salinity.
I am at 35ppt salinity…