Going 4 months without a PWC
does not prove that you are doing anything right, it just says you were lucky this time. It would be like me running through a mine field and making it through and then saying I told you there were no mines in there when we know there is. And BTW Iodine does aid in the molting process. This was under a certain invert in Liveaquaria. "Most of the diet will consist of food it scavenges, but supplementing with iodine-rich foods will help ensure proper molting."