Question 1, Calcium

[Samw]

Originally Posted by Beverly

Steve,

I have never read that higher levels of Ca than NSW slows coral growth. Can you provide a quote and source for this statement? TIA

I'm guessing that raising Calcium to overly high levels must result in overly low Alk levels since there's an inverse relationship between the 2. So I assume coral growth slows for that reason.

http://www.advancedaquarist.com/issues/nov2002/chem.htm

"If, for example, you add too much of a calcium supplement, you will drive down alkalinity as you get precipitation of calcium carbonate in the tank. Likewise, adding too much of an alkalinity supplement can result in reduction of calcium. "


I wonder if adding aragonite to my top off water reservoir has any benefit. The fresh water is low in PH and should very very slowly dissolve the aragonite and add calcium and alk into the top off water.