There will certainly be some dissolution of the substrate within our systems, but as I stated, not in any amount I would take into consideration. My understanding is that a pH of 7.7 is required to disolve Ca. My tank doesn't usually get that low. If things made of Ca started dissolving in my tank, I'd be worried about my Ca based inverts.
Now, in a 150g fully stocked SPS tank, I used about 20 pounds of reactor media in addition to kalk top off to maintain Ca and Alk per year. This tells me that anything comeing from the substrate is at best negligible.
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Brad
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