iodine x clams

is iodine really necessary for clams? can levels of iodine a little higher than 0.06 ppm do any harm to tridacnas? does anybody uses lugol for adding iodine to the tank? i saw in sprungÃ"šÃ‚´s book that we sould use 1 drop per 20g per week. is this right?
 
I would not dose Iodine. I've heard of many problem from people over-dosing, but never from not. A regular water change should keep levels in check :) But, if you are concerned, test first, then dose only if necessary. Some of the best advice I ever got was "don't dose anything you don't test for"
Best of luck!
Jeff
 
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