Good link Marie.
I would not worry about the ph to much. As long as the tank has good water movement and oxygen/co2 exchange. The best for that being overflows to a sump and skimmers.
Nothing wrong with dripping a kalk mix, even before corals. However as mentioned, it may not be required, so pay good attention to your calcium and alk. levels. Perhaps just a slow drip at night for now.
I would try keep the calcium just around or a bit under 400ppm for now and the alk. around 7dkh to 9dkh. If water changes do not maintain those , as coralline starts to grow, then some kalk will. If a boost in alkalinity is needed, you could always use one of the commercial additives for that or even plain old baking soda.
Like the article above mentions though, pay close attention to the balance and use to much of a single type of calcium or alkalinity additve. This refers mainly to the use of things like calcium chloride to boost calcium levels.
Kalk is actually a pretty good balanced additive, keeping both calcium and alkalinity levels in check, depending on the demand and evaporation rates, of course. Aquarists that use kalk only, may need an occasional alk. additive, like mentioned above.
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Doug
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