Dosing pure iodine in tanks can be risky as it is pretty potent. Most "iodine" suppliments are sold today are actually a form of potassium iodide, which is a bit less potent. However, I have seen no scientific data suggseting that the addition of Iodine is benefical to a reef tank. Most of the experience out there is anecdotal at best. Keep up with the regular water changes and your iodine levels should be just fine.
Some people are like slinkies...they serve no real purpose yet can still bring a smile to your face when you push them down the stairs!:p
Have a great day! Brian