#1...double check that result. It is unusual.
If you are not adding anything to the tank, it begs the question..."how did it get that high?".
Mix up a fresh batch of SW and measure it. See if that is where the problem lies. If the new mix has more appropriate levels, then do a partial water change to get things back somewhat in line. I don't know of any brand of salt that mixes to readings like that, so suspect your test kit/procedure as well.
All in all...high DKH isn't a serious problem. It should correct itself over time with regular water changes, but you do need to figure out why it got high in the first place.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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