FWIW, I had the biggest clumps of pulsing xenia that you can imagine in my old 72gal and it pulsed through low alk and no addition of iodine. I'm not sure why yours has stopped pulsing but I'd guess low pH (or at least check that as a possible reason). I've also read what both BCOG and Christy have suggested, I know I had low alkalinity and my Salifert test kit showed no reading on iodide whatsover (I have to think I had some in my system but have read that hobby level kits are a waste of money and I tend to agree). Xenia is a funny little creature, it will thrive in one set up and crash in another for no apparent reason.
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