Ok sence this won't die
I will explain my point of view on the phosphates issue for more clarification.
if you look at natural process of binding in the ocean you will find that Mg grabs the Ca moliques and basicly seals them off by binding them untill the Ca is nutraly charged. This has been pointed out my RHF and a few other chemists.
the problem where I could see phosphate binding to Ca is if your tank is Mg difecient and Phosphate rich, you might have phosphate binding because there isn't enuf Mg to do it.
but if you have a proper range of Mg you should get Ca that is "Mostly" Mg bound because Mg is much higher on the reactive list than phosphate. (I am going off memory on this one so if some one has a reactive eliments chart that shows different let me know)
Steve
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