So far tank is going it’s way slowly - there are very slight brown powder on the sand - I assume diatoms. Today I vacuumed part of the sand bed and possibly found a reason why I have elevated Ca and Mg levels - my refractometer was off and salinity was 1.028. Replaced 1.5 gal of water with RO/DI to reduce it. How can average Joe see something with those tiny refractometers?!? [emoji4]
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