I don't recall having seen the plural as "media" in this context so I assumed that it took the same added "s" as the crystal-gazers. Checking Webster's Ninth Collegiate Dictionary, the plural of medium is given as, first, mediums and second, media, which indicates that the simple addition of the s is currently the preferred form.
The only definitions for which this source cites "media" as the plural are "a channel or system of communication, information, or entertainment" and "a nutrient system for the artificial cultivation of cell or organisms, esp. bacteria."
My art library's in my studio so I don't have it handy for checking, but I suspect this may create a lively debate. And who can blame people for saying "mediums" when even major dictionaries promote that usage?
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