Could be.
I've had Ca 400 and alk 15 (testing with Salifert) a couple of times.
Looking through my notes, on a 200g lightly stocked reef, after turning off the CO2, the alk would drop from 15 to 11/12 after 3-4 days without a water change.
Last edited by mark; 04-15-2008 at 03:03 AM.
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