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It is not ill advice and it certainly isn't misleading. If your calcium levels are within 380 to 450 ppm then there isn't an issue. These levels get depleted as your reef matures. Having said that if regular water changes are done the salt mix you use will take care of the extra calcium needed and having a calcium reactor if you have stoney corals is good if its used properly. Yes there is a relationship between calcium levels and alkalinity. If you test for Calcium and its too high i.e. in excess of 500ppm then there is a tendency for alkalinity to drop. Conversely if alkalinity levels get too high then then calcium levels will tend to fall. If your calcium levels are stable then your kh levels will be stable. (7 to 10 dkh).Dkh and kh are one and the same thing. Kh is basically the alkaline buffering capacity of your aquarium. It isn't a measure of the actual alkalinity level in your aquarium. PH levels will tell you how acidic or alkaline your aquarium is. if you have a very unstable KH level in your aquarium look into causes such as a large amount of decomposing organic material. We have all too often seen a mess created with the zealous use of test kits. Wrong readings and expired batches result in unnecessary dosing with disastrous consequences. This following article is useful. http://www.reefecosystems.com/reef-facts/water-chemistry-and-parameters/calcium-alkalinity-and-magnesium/