The rule I followed, raise Mg by 50ppm then observe tank for adverse reaction, next day raise by 50ppm and observe for any adverse reactions. If no corals/clams are acting funny, then raise by 100ppm(observe again). Continue 100ppm increments until desired level its reached. If any corals (especially sticks and clams) start having adverse reactions, back off on the rate you are raising your mg.
Side note, keep track of your coral/clam growth while raising mg. Mine exploded between 1600-1700ppm. It's just nice to know what my tank likes to be at.
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