Did you ever have any resolution to this issue? I switched to Reef Crystals in Spring of 2018 and have been chasing an STN issue that I can only seem to trace back to this time frame when I first made the switch. I’m wondering if there may be an excess of some trace element or metal in the salt that is causing this problem.
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180g SPS -3 x 250w Radiums, 2 x VHO actinic, DIY RB LED strip, and a EuroReef skimmer modded with a DC pump.
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