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Alex asked about Hydrated lime and dolomite.
Both limestone and dolomite are naturally occuring minerals which contain
carbonate (CO3). Limestone is a form of Calcium Carbonate - CaCO3. Dolomite
is a form of Calcium Magnesium Carbonate - CaMg(CO3)2.
If you take limestone, CaCO3, and heat it to a high enough temperature
("calcine" it), CO2 gas is driven off, leaving CaO, which is a caustic
chemical commonly called Quicklime.
If you take Quicklime (CaO) and treat it with steam (H2O), you get a less
caustic substance commonly called Hydrated lime Ca(OH)2
CaO + H2O --> Ca(OH2)
Quicklime and Hydrated lime have many uses, but I'd be very careful of
either one around an aquarium. If you are looking for a source of Ca and or
Mg, either plain limestone or dolomite (or marbel chips or even egg shells)
would probably be safer