Thanks for the tip!
Another helpful tip from the reef aquarium hobby: Pickling lime (aka slaked lime) will do the same job (possibly better, since it is much more soluble). It is calcium hydroxide, which rapidly converts to calcium carbonate in the presence of carbon dioxide.
If you want to experiment with adding magnesium as well, check out Epsom salts. I've saved a ton of money over the years using those two additives to maintain the calcium, alkalinity, and magnesium in my aquariums instead of the pricey supplements from the fish store.
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