Not allowing for o2 exchange will raise your co2 level leading to a drop in ph. 1500 Imo is not bad for your mag but I would not exceed that level, I would say stop dosing the mag and let it that number naturally fall to see how it effects your balance between your alk an ca. As for the salinity, may be a silly question but you are using freshwater in your ato and not saltwater right?
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