06-01-2009, 07:00 PM
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you should be testing alkalinity as well (units are dKH for saltwater, not KH or GH). You are adding alkalinity supplements to your tank (reef carbonate and purple up), and for all we know the alkalinity might already be high enough. I'm just guessing here, but you might be pushing your alkalinity through the roof, which is keeping your pH buffered at an elevated level like you are seeing (?). Alkalinity and pH are directly related to one another (as is calcium & alkalinity, and magnesium & calcium... four-way relationship). Definitely get an alkalinity number for your tank first, then lets take it from there.
A healthy marine tank should have an alkalinity between 8-12 dKH (I like to keep mine higher within that range, between 10-12... if I drop tp 8 or 9, I begin supplementing to bring it back up).
Last edited by conger; 06-01-2009 at 07:02 PM..