[APD] Calcium Nitrate

["Kettle, Sean" <skettle at snclavalinprofac_com>]

Since I have almost non-existent gH (less than 1 degree of measured gH),
I was thinking of switching from using calcium carbonate to calcium
nitrate.  CaCO3 takes a fair bit to dissolve in my tank and I don't have
a local source of the more soluble calcium chloride.
 
Has anyone used calcium nitrate in their tanks?  Does it dissolve
quickly or will it essentially be six of one, half a dozen of the other
compared to dissolving CaCO3?
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