How much do you dose?

[asylumdown]

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

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.