Quote:
Originally Posted by asylumdown
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.
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I do test it, it seems to stay in the recommended range, but i have upgraded to a bigger tank so i might need to start dosing.