Quote:
Originally Posted by CM125
I don't have any SPS, so Im sure my water changes are enough to keep to keep the levels good
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Lots of things consume carbonate ions, and thus lower alkalinity. Your skimmer exports quite a bit, organic acids produced by the things living in your tank, and all sorts of calcifying plants and animals you didnt buy make it in to every reef tank. It's a good idea to periodically test, even if you aren't dosing.