After thinking about it for a bit here, I have come to my own detemination, and hopefully this is correct. With the water level lowering during the day, due to evaporation, The magnisium level rises, like my saline level. The auto topoff kicks in, and tops off the tank over night, usually. Will test in the morning, like usual. And will do water change, to try to lower possible overdosed mag level.
Last edited by Douglas; 04-08-2011 at 02:33 AM.
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