Originally Posted by mr funktastic
Really? I've heard countless times its does raise it up. Not a lot but it does. I akways thought it was another reason its not reccomended for fresh water. Learn something new everyday.
Not to throw this thread off topic too much..... but.
Crushed coral is calcium carbonate. It's the same thing that the hard skeletons of SPS
corals are made of. As the name implies, it's the crushed skeletons of hard corals. It's also what's used as a media in calcium reactors. In order for the calcium carbonate to dissolve and have any buffering affect, the pH in the water needs to be 7.4 or lower, which is why a calcium reactor needs co2
to be injected into it. It's how the pH drops. In a normal saltwater system, the pH will never drop that low. The alkalinity in the water prevents it. Now, if it were true that crushed coral did buffer the water, it would mean that is started to dissolve and since it's the same as live SPS
corals...and also live rock, all your corals would start to dissolve along with your live rock and sand....if you used any type of aragonite sand.