It's very difficult to measure accurately your Iodine levels and because it can be toxic if overdosed I wouldn't dose it. I've had Xenia before and never added Iodine and it grew at a rediculous pace, eventually I removed it all from my tank.
Randy Holmes-Farley recommends dosing Iodide instead of Iodine which is much easier to test for.
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Finally, for those interested in dosing iodine, I suggest that iodide is the most appropriate form for dosing. Iodide is more readily used by some organisms than is iodate, and it is detected by both currently available iodine test kits (Seachem and Salifert).
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