Reefnut said:
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.but there is a thin white film now covering all my rock and sand.
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That white film is a precipitate caused by the calcium additive, most likely too much CA+. I'm not an expert on the relationship between CA+ and magnesium etc but I would venture to say that they're out of balance. IMO, if you want to get eveything balanced do a large water change before your corals start to suffer.