well 640 is a bit high the Cal should be around 425-450 and the alk at 8-11DKH or 3.5-4.5 Meg /per l
So just let the corals consume the cal until down to 450 or you can always per a water change to bring it down , But its should hurt it. If you run the Calcuim lever high on the tank your pumps will start to get affected by the high CAL.
hth
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180 starfire front, LPS, millipora
Doesn't matter how much you have been reading until you take the plunge.
You don't know as much as you think.
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