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Calcium source?

<tried to send this, but never saw it arrive...  so if this is 
a dupe, please ignore it>

While at a gardening store, looking for KNO3, I noticed a product 
called Foli-Cal 10% Calcium Concentrate.  Does anyone have any 
experience with this as a souce of aquarium calcium?  Its made 
for terestrial plants, which makes me hope its also available 
to aquatic plants.

Here is some more info for those able to interpret it...


Some other similar calcium products

this one is calcium and nitrogen

On a side note, I mixed up some dolomite and water, and the KH went 
through the roof, but the GH still reads 0.  What am I doing wrong?