Thank you all so very much!!! It sounds like it would drop the pH such that one might be able to use the pagoda or seiryu stones.
Several months ago I posted this thread relative to pagoda rock:
http://www.aquariumadvice.com/forums/f12/aquarium-rock-question-305747.html
My seiryu stones fizzed in vinegar so I put them on the side for my daughter's garden. I might run some tests.
Thank you greatly!!!
(Friend of Bill W., One day at a time)