[Randy Holmes-Farley]

I don't believe that skimmers remove iodine. There are no forms of inorganic iodine that absorb at air/water interfaces.

IMO, this is a myth that has long been around without any scientific basis of which I'm aware.

FWIW, iodine depletion has been noted to be just as fast in tanks with no skimming as in those with skimming.

What can take place is that skimmers may remove organisms that themselves contain, and perhaps have selectively sequestered, iodine.

Skimmers may also remove organic iodine compounds, if any substantial amounts are present (which is, as far as I know is uncertain).