how to maintain alkalinity and magnesium?

or as naturally as possible i should say. i know there are a TON of additives.............so which ones are the best/more natural

...like using limewater and such.
 
limewater is good. But i like baking soda and calcium chloride with the occasional use of magnesium chloride in my fish only system.

Best for reef with calcifying organisms is limewater or a calcium reactor using Co2 to dissolve CaCo2 media. Some people need both.
 
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