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So started testing frequently about a month ago (use to just test when things were going wrong which is what started this and trying to get into the habit of regular testing) and my alk, calcium and PH have all been stable (11dkh, 440 ppm, and 8.2) but my nitrates seem to be staying at 80 ppm... I have done 60 gallon water change (tank is a 180gal), started carbon dosing (doing 5mL 2x a day) and upgraded the protein skimmer to a bubble magus curve 7, but my nitrates are staying at 80 ppm... Any ideas would be helpful cause im running out of ideas on how I could lower them... Also have about a 4 gallon refugium. Im using API tests for all 4 parameters, I also tested my RODI water for top off and water changes and that was reading 0 ppm.