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vitodog how big is your co2 tank? It has to be leaking either at tank to carbon doser or inside the carbon doser, or the carbon doser gauges fittings. If the carbon doser regulates properly, then it doesn’t matter if there is a leak after it on in the reactor cause it’s only letting out so little air that it shouldn’t deplete in a month, unless you are running at a really high bubble count which I doubt.