I understand that those off-the-shelf dechlorinators are also effective on eliminating iodine. This makes some sense if you look at the periodic table...chlorine, bromine, iodine are all halogens.
I would only advocate use of the dechlorinator if the iodine overdose looks so severe that you are seeing immediate death occuring. The cure could be as bad as the disease.
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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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