There is no way you can compare FW and SW. Crushed coral will not buffer pH. Your pH has to be lower than 6.5 for the crushed coral to dissolve and make any difference. By then, it's too late. This little set up you're talking about will also increase your maintenance time. FORGET IT. SSB with good aragonite sand.
Jasno999 isn't testing his water quality. As I said before, if you don't test, then theoretically, your water tests whatever you choose the results to be.
Once again, you avoid the advice of experienced members of the site and you look to verify your wrong answers with someone who doesn't even really know his parameters.
Rick, I'm trying as hard as I can to avoid posting on your threads, but you're killing me. I love the hobby and there is nothing more that I want than for people to succeed. The questions you are asking show how little prepared you are to keep a SW tank.
Deanos has been in the hobby for years. He's well read and if you ask a ?, he'll find you a link. He's also got a beautiful reef. Do you know what he got this year for Christmas? A set of reef books. You want to make the best investment you can in SW, BUY SOME BOOKS!!! Simple reading will stop you from posting stupid questions. Every thread started by you could have been answered in the first 100 pages of Volume 1 of The Reef Aquarium.