fishbait
I found Nemo
how long did you have them before they died? have you ever noticed them molt? mine molts every 3-4 weeks. if you had them for a month or two and never saw them molt, then I would say that's the problem. but, in my opinion if you are doing regular water changes, and in sufficient amounts, there is no reason to dose iodine. unless you are using a brand of salt that is deficient in it.