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- Feb 25, 2015
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I have a 20g reef aquarium with 2 turbo snails, some soft corals (zoas, palys, mushroom, just added a birdsnest coral a few days ago). I perform a 2-part dosing from Seachem Prime to support Ca/Mg in the tank. I dosed about two weeks ago and the measurements were high (Ca = 485, Mg = 1335) and my Alk was 10.3. I test Alk with a Hannah checker and Ca/Mg with Salifert testing. Today, my readings were Alk = 8.17, Ca = 475, Mg = 1380. I'm kind of surprised that over two weeks my Mg went up and my Alk is dropping - is that normal? Is there a reason that happened, and is there a way to bring up my Alk without continuing to dose any of these nutrients?