Randy Holmes-Farley
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My Tank Thread
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When I had my calcium over 550 when mixing new salt for a new tank, it precipitated and made the tank white cloudy. Your tank is clear, I would think and assume if your calcium was that high, it have precipitated out.
Calcium carboante is far more likely to precipitate in new raw salt water than in a reef tank witht he same properties. That is easily seen with folks using high alk products such as Red Sea Coral Pro, where precipitation is common.
The issue is that the phosphate, organics, and even whole bacteria tend to prevent ongoing precipitation of calcium carbonate in a reef tank, but are typically quite low in new salt water. They get onto any existing or newly formed calcium carbonate surfaces and block further precipitation of calcium carbonate.