If you keep anything alive in your tanks, then it will use up calcium carbonate.
The question is, how best to replace the depleted CaCO3. Without knowing
roughly how much is being removed then the replacement method is at best
a wild guess. You may end up with a Calcium reactor when just the odd water
change is required. The more likely problem is knowing when limewater alone
can not keep up with your corals requirements
Because coral growth is quite slow, the amount of CaCO3 is stated in terms of kilograms per square meter per year. In our situation, its ok to treat the aquarium as being 2 dimensional (flat). Sure you might have some corals that are growing vertically above another but we are after ballpark numbers, not super-precision figures.
Pretty much an empty tank with Aragonite sand in it doesn't consume CaCO3. Some sand does dissolve but not at any appreciable rate so this system is considered the baseline and is said to lay down 0 kilograms of CaCO3.
Ok, we've got zero, whats the upper limits? Sorokin and Bingman state that at max, we are looking at 20kg/m2/yr and that is for a totally and densely packed metre square of Acropora. Pretty much that is impossible to achieve in an aquarium. Bingman suggests that 10kg/m2/yr is a more realistic figure although from my own experience, I know that its possible to exceed this figure.
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