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Onyx sand and hard water

Regarding the amount Onyx contributes to KH and GH, I would have to say
it's a lot more than a couple of "points."

I use R/O water, and normally, my tanks would have KH=2 and GH=3.
With Onyx they run at KH=6-8 and GH=10+

The Onyx is in two tanks and both were set up less than 5 months ago. 
I am a little disappointed in the high numbers since I was hoping to
finally grow Cabomba successfully since I added lots more light, but it
hates the hardness.  It won't grow, at least not this early in the
tanks's development.

Greg Morin, I change water once a week, 30%.  I am sincerely hoping I
will not be restricted to hard water plants forever in these tanks!

Thanks, Roxanne