720ppm of Ca?!!!!
Jon - If nothing is using up the Ca then it can accumulate. Are you using tap water? Our water is very high in carbonates so it is pretty easy to get a pretty high Ca reading.
If Alk is low then even if you have stuff that can use up the Ca, nothing will be able to. Thus I find it more important to dose my buffer soln over dosing my Ca soln (although by dosing the Alk I do have to dose the Ca in order to keep it near NSW levels).
Ah, one day I'll get me a Ca/Rx. One day...
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