There is alot of wives tale around Iodine and Xenia. Yes Xenia likes it, but never dose anything you dont test for. Xenia seems to prefer imperfect water conditions. instead of dosing Iodine, I would suggest more waterchanges and perhaps turning back the skimmer or putting it on a timer. Xenia is a fickle thing, it explodes in some tanks and never really steps it up in others. You will likley get a hundred different forms of advice on it. But I would say no to the iodine. Mine spreads like mad without it.
JMO