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I have come to the conclusion that I need to supplement my tank with 
calcium.  In particular, I am having a terrible time growing regular 
old swords.  Nearly everthing else thrives.

Currently I mix my water from RO with RO Right (or something like it), 
as well as Baking soda and Epsom salts (about 1.5 tsp of each per 30 

Since the goal is very soft water, I would rather not raise the GH 
much, and I think I need the Mg in the epsom salt, so I was hoping to 
replace the baking soda with calcium carbonate, which, if I understand 
the chemistry correctly, would allow me to raise the KH without 
raising the permanent hardness much.

Does anyone know of a source of calcium carbonate?  Would, for 
example, one of the reef calcium supplements serve this purpose?

Do I have the chemistry straight?


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